FSI INTERNATIONAL INC
SC 13G/A, 1998-04-03
SPECIAL INDUSTRY MACHINERY, NEC
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934

                                (Amendment No. 1)


                             FSI International, Inc.
                                (Name of issuer)

                           Common Stock, No par value per share
                         (Title of class of securities)

                                    302633102
                                 (CUSIP number)


The  remainder  of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
notes).

<PAGE>



- --------------------------------------------------------------------------------
  1      NAME OF REPORTING PERSONS
         S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

         EQSF Advisers, Inc.
         (EIN 13-3354359)

- --------------------------------------------------------------------------------
  2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a)  [   ]
                                                                (b)  [ X ]
- --------------------------------------------------------------------------------
  3      SEC USE ONLY

- --------------------------------------------------------------------------------
  4      CITIZENSHIP OR PLACE OF ORGANIZATION

                     New York Corporation

- --------------------------------------------------------------------------------
                                 5      SOLE VOTING POWER

                                                 3,293,500

          NUMBER OF            -------------------------------------------------
            SHARES               6      SHARED VOTING POWER
         BENEFICIALLY
           OWNED BY                                     None
                               -------------------------------------------------
             EACH                7      SOLE DISPOSITIVE POWER
          REPORTING
            PERSON                               3,293,500

                               -------------------------------------------------
             WITH               8       SHARED DISPOSITIVE POWER

                                                         None
- --------------------------------------------------------------------------------
 9       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                  3,293,500

- --------------------------------------------------------------------------------
 10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
         CERTAIN SHARES*                                        [    ]

- --------------------------------------------------------------------------------
 11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
 
                  14.55%

- --------------------------------------------------------------------------------
 12      TYPE OF REPORTING PERSON*
 
                  IA

- --------------------------------------------------------------------------------

*SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>



- --------------------------------------------------------------------------------
  1      NAME OF REPORTING PERSONS
         S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

         M.J. Whitman Advisers, Inc.
         (EIN 13-3686379)

- --------------------------------------------------------------------------------
  2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a)  [   ]
                                                                (b)  [ X ]
- --------------------------------------------------------------------------------
  3      SEC USE ONLY

- --------------------------------------------------------------------------------
  4      CITIZENSHIP OR PLACE OF ORGANIZATION

                     New York Corporation

- --------------------------------------------------------------------------------
                                 5      SOLE VOTING POWER

                                                 931,100

          NUMBER OF
                               -------------------------------------------------
             SHARES               6      SHARED VOTING POWER
         BENEFICIALLY
           OWNED BY                                   None
                               -------------------------------------------------
             EACH                7      SOLE DISPOSITIVE POWER
          REPORTING
            PERSON                               931,100

                                ------------------------------------------------
             WITH               8       SHARED DISPOSITIVE POWER

                                                      None
- --------------------------------------------------------------------------------
 9       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                  931,100

- --------------------------------------------------------------------------------
 10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
         CERTAIN SHARES*                                        [    ]

- --------------------------------------------------------------------------------
 11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
 
                  4.11%

- --------------------------------------------------------------------------------
 12      TYPE OF REPORTING PERSON*
 
                  IA

- --------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>



- --------------------------------------------------------------------------------
  1      NAME OF REPORTING PERSONS
         S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

                  Martin J. Whitman


- --------------------------------------------------------------------------------
  2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*      (a)   [   ]
                                                                (b)   [ X ]
- --------------------------------------------------------------------------------
  3      SEC USE ONLY

- --------------------------------------------------------------------------------
  4      CITIZENSHIP OR PLACE OF ORGANIZATION

                  USA

- --------------------------------------------------------------------------------
                                 5      SOLE VOTING POWER

          NUMBER OF                              None  (See Item 4)
                               -------------------------------------------------
                                 6      SHARED VOTING POWER
            SHARES
                                                 None
         BENEFICIALLY

           OWNED BY
                               -------------------------------------------------
              EACH                7      SOLE DISPOSITIVE POWER

          REPORTING                              None  (See Item 4)

                                ------------------------------------------------
         PERSON WITH            8       SHARED DISPOSITIVE POWER

                                                 None

- --------------------------------------------------------------------------------
 9       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                  -0-    (See Item 4)

- --------------------------------------------------------------------------------
 10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
         CERTAIN SHARES*                                        [  ]

- --------------------------------------------------------------------------------
 11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

                  -0-

- --------------------------------------------------------------------------------
 12      TYPE OF REPORTING PERSON*

                  IN

- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

Item 1.
     (a) Name of Issuer: 
         FSI International, Inc. (the "Issuer").

     (b) Address of Issuer's  Principal  Executive  Offices:  
         322 Lake Hazeltine Drive, Chaska, MN 55318
 
Item 2. 
     (a) Name of Person Filing: 
         This  schedule is being jointly filed by  EQSF Advisers, Inc. ("EQSF"),
     M.J.  Whitman  Advisers,  Inc.  ("MJWA") and Martin J.  Whitman,  the Chief
     Executive Officer of EQSF and MJWA and controlling person of EQSF and MJWA.
     (EQSF,  MJWA and Martin J. Whitman are sometimes  collectively  referred to
     hereinafter  as  "Filer").  Attached  hereto as an exhibit is a copy of the
     joint Schedule 13G filing agreement among the reporting persons.

     (b) Address of Principal Business Office:
         The  address of  the principal executive office of EQSF,  MJWA  and Mr.
         Whitman is: 767 Third Avenue,  New York,  New York 10017-2023.

     (c) Citizenship:

         The  citizenship  or  place  of  organization of  each of the reporting
         persons is as follows:

         EQSF
         New York State corporation.

         MJWA
         New York State corporation.

         Martin J. Whitman
         United States citizen.

     (d) Title of Class of Securities:
         Common Stock, No par value per share.

     (e) CUSIP Number:
         302633102


<PAGE>

Item 3.  If this  statement  is  being  filed  pursuant  to  Rules  13d-1(b), or
         13d-2(b), check whether the person filing is a:

     (e) Investment Adviser  registered  under  section 203  of  the  Investment
         Advisers Act of 1940 (EQSF and MJWA).
                                                                                

Item 4.  Ownership.
     (a)&(b)  EQSF beneficially owns 3,293,500 shares, or 14.55% of the class of
         securities of the issuer.  MJWA  beneficially  owns  931,100 shares, or
         4.11% of the class of securities of the issuer.

     (c) (i) EQSF:  3,293,500
             MJWA:  931,100

         (ii) Not applicable.

         (iii) EQSF:  3,293,500
               MJWA:  931,100

         (iv) Not applicable.

         Mr. Whitman disclaims beneficial ownership of all such shares.

Item 5.  Ownership of Five Percent or Less of a Class.
                  Not applicable.

<PAGE>

Item 6.  Ownership of More than Five Percent on Behalf of Another Person.
                  Third  Avenue Value Fund,  an  investment  company  registered
under the  Investment  Company Act of 1940,  has the right to receive  dividends
from,  and the proceeds  from the sale of,  2,820,900 of the shares  reported by
EQSF; Third Avenue  Small-Cap  Value Fund, an investment  company  registered
under the  Investment  Company Act of 1940,  has the right to receive  dividends
from, and the proceeds from the sale of, 412,700 of the shares reported by EQSF;
and Third Avenue Value  Portfolio of the WRL Series Fund, an investment  company
registered  under the  Investment  Company Act of 1940, has the right to receive
dividends  from, and the proceeds from the sale of 59,900 of the shares reported
by EQSF. Various clients for whom MJWA acts as investment advisor have the right
to receive  dividends from, and the proceeds of the sale of, the shares reported
by MJWA.

Item 7.  Identification and  Classification  of the  Subsidiary  Which  Acquired
         the Security Being Reported on By the Parent Holding Company.
                  Not Applicable.

Item 8.  Identification and Classification of Members of the Group.
                  Not applicable.

Item 9.  Notice of Dissolution of Group.
                  Not applicable.

Item 10. Certification.
                  By signing  below I certify  that, to the best of my knowledge
and  belief,  the  securities  referred to above were  acquired in the  ordinary
course of business  and were not acquired for the purpose of and do not have the
effect of changing or influencing  the control of the issuer of such  securities
and were not acquired in connection  with or as a participant in any transaction
having such purposes or effect.

<PAGE>


                                    SIGNATURE

                  After  reasonable  inquiry and to the best of my knowledge and
belief,  I certify  that the  information  set forth in this  statement is true,
complete and correct.


                                                                   April 3, 1998
                                                                          (Date)




                                                     EQSF ADVISERS, INC.

                                                     By: /s/   MARTIN J. WHITMAN
                                                     Martin J. Whitman
                                                     Chairman, President and
                                                     Chief Executive Officer





                                                     M.J. WHITMAN ADVISERS, INC.

                                                     By: /s/   MARTIN J. WHITMAN
                                                     Martin J. Whitman
                                                     Chairman and Chief 
                                                     Executive Officer





                                                     /s/MARTIN J. WHITMAN
                                                       Martin J. Whitman




                             JOINT FILING AGREEMENT


                  In  accordance  with  Rule  13d-1  (f)  under  the  Securities
Exchange  Act of 1934,  as amended,  the  undersigned  hereby agree to the joint
filing  with all  other  Reporting  Entities  (as such  term is  defined  in the
Schedule  13G)  on  behalf  of  each of them  of a  statement  on  Schedule  13G
(including  amendments  thereto) with respect to the Common Stock,  No par value
per share, of FSI International, Inc., and that this Agreement be included as an
Exhibit to such joint  filing.  This  Agreement may be executed in any number of
counterparts  all of which  taken  together  shall  constitute  one and the same
instrument.


                  IN  WITNESS  WHEREOF,  the  undersigned  hereby  execute  this
Agreement this 3rd day of April, 1998.



                                                    EQSF ADVISERS, INC.

                                                   By:  /s/    MARTIN J. WHITMAN
                                                   Martin J. Whitman
                                                   Chairman, President and Chief
                                                   Executive Officer




                                                   M. J. WHITMAN ADVISERS, INC.

                                                   By:   /s/   MARTIN J. WHITMAN
                                                   Martin J. Whitman
                                                   Chairman and Chief Executive
                                                   Officer




                                                    /s/   MARTIN J. WHITMAN
                                                    Martin J. Whitman



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