Exhibit 10.k
AMENDMENT NO. 1
TO SHAREHOLDERS AGREEMENT
     AMENDMENT NO. 1 (this “Amendment”), dated as of August 31, 2006, to the
SHAREHOLDERS AGREEMENT, dated as of June 6, 2002, as amended and restated as of
July 19, 2002 (the “Shareholders Agreement”) by and among TRIMAS CORPORATION, a
Delaware corporation (the “Company”), METALDYNE COMPANY LLC (“MCLLC”), HEARTLAND
INDUSTRIAL PARTNERS, L.P. and the HEARTLAND ENTITIES identified on the signature
pages thereto and the other parties identified as SHAREHOLDERS therein and
listed on the signature pages thereto or identified on the signature page of any
Joinder Agreement executed and delivered pursuant to the Shareholders Agreement
and the parties identified on the signature pages hereto as “METALDYNE
SHAREHOLDER PARTIES”. Capitalized terms used but not otherwise defined herein
shall have the respective meanings ascribed thereto in the Shareholders
Agreement.
R E C I T A L S :
     A. MCLLC is the owner of 4,076,087 shares of the issued and outstanding
Common Stock of the Company and a Warrant to purchase 750,000 shares of Common
Stock of the Company (the “Warrant” and, together with the shares of Common
Stock owned by MCLLC or issuable upon exercise of the Warrant, the “Metaldyne
Shares”) on the date hereof.
     B. MCLLC is considering making a distribution of the Metaldyne Shares to
its parent company, Metaldyne Corporation (“Metaldyne”), which will, in turn,
make a distribution of the Metaldyne Shares to the stockholders of record of
Metaldyne and MCLLC has requested an amendment of certain provisions of the
Shareholders Agreement to permit the foregoing.
     C. The Company, MCLLC and the other Shareholders desire to amend certain
provisions of the Shareholders Agreement to permit the Metaldyne Distribution
(as hereinafter defined), but, as a condition to its willingness to execute the
Amendment, the Company is requiring that all current stockholders of Metaldyne
that are also currently parties to the shareholders agreement in place with
respect to shares of common stock of Metaldyne execute this Amendment and agree
to the provisions of the Shareholders Agreement in anticipation of the Metaldyne
Distribution in the event that it should occur.
     NOW, THEREFORE, in consideration of the premises and mutual agreements
contained herein and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

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A G R E E M E N T :
          The parties agree as follows:
     1. Amendment to Introduction. (a) The Preamble to the Shareholders
Agreement is hereby amended by adding “either” after the word “executing” and by
adding the following after the word “hereof”: “and, with respect to the
Metaldyne Shareholders, upon the occurrence of the Metaldyne Distribution”. It
is hereby agreed that, from and after the Metaldyne Distribution, the Metaldyne
Shareholder Parties shall be “Shareholders” for all purposes of the Shareholders
Agreement.
          (b) The first “Whereas” clause of the Shareholders Agreement is hereby
amended by adding the following at the end of such clause: “and, upon the
occurrence of the Metaldyne Distribution (if it should occur), each Metaldyne
Shareholder Party has received its pro rata share of the Distributed Shares
pursuant to the Metaldyne Distribution.”
          (c) The second “Whereas” clause of the Shareholders Agreement is
hereby amended and restated as follows: “WHEREAS, as a result of and in
connection with the Stock Purchase, each Shareholder as of July 19, 2002 owns
the number of shares set forth on Schedule 2.04 hereto and, as a result of and
in connection with the Metaldyne Distribution (if it should occur), MCLLC will
no longer own the Distributed Shares reflected on Schedule 2.04 hereto and each
Metaldyne Shareholder Party will own its pro rata share of the Distributed
Shares.”
     2. Amendment to Section 1.01. (a) Section 1.01 of the Shareholders
Agreement is hereby amended by adding the following at the end of the definition
of “Transfer”: “; provided that the declaration (as opposed to the making) of
the Metaldyne Distribution shall not be considered to be a Transfer for purposes
of the Shareholders Agreement.”
          (b) Section 1.01 of the Shareholders Agreement is hereby amended by
inserting the following defined terms (in their appropriate alphabetic order)
into such section:
“Distributed Shares” means any shares of Common Stock or of all or any portion
of the Warrant that, in either case, is subject to a Metaldyne Distribution to
Metaldyne Shareholders.
“First Amendment” means Amendment No. 1 to Shareholders Agreement, dated as of
August 31, 2006, among the Company, MCLLC, Heartland Industrial Partners, L.P.,
the Heartland Entities identified on the signature pages thereto, the other
Shareholders listed on the signature pages thereto and the Metaldyne Shareholder
Parties listed on the signature pages thereto.

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“First Amendment Date” means August 31, 2006.
“Limited Permitted Transferee” means (a) with respect to any Shareholder that is
a natural person, (i) the spouse or any lineal descendant (including by adoption
or stepchildren) of such Shareholder or any Transferee of such Shareholder by
operation of laws of descent, (ii) any trust of which such Shareholder is the
trustee and which is established solely for the benefit of any of the foregoing
individuals and (iii) any partnership, all of the general partner(s) and limited
partner(s) (if any) of which are one or more Persons identified in the preceding
clause (i) and (b) with respect to any other Person, an Affiliate of such
Person.
“Metaldyne Distribution” means any distribution by MCLLC to Metaldyne or by
Metaldyne to Metaldyne Shareholders of any shares of Common Stock (including
shares of Common Stock issuable upon exercise of the Warrant) or of all or any
portion of the Warrant.
“Metaldyne Shareholders” means (i) the owners of record of the common stock of
Metaldyne Corporation as of the record date of any Metaldyne Distribution or
(ii) any legal successor-in-interest to or any Limited Permitted Transferee of
any Person referred to in clause (i) of this definition.
“Metaldyne Shareholder Parties” means (i) those owners of record of the common
stock of Metaldyne Corporation as of the First Amendment Date that are party to
the Shareholders Agreement relating to shares of common stock of Metaldyne dated
as of November 28, 2000 among Metaldyne and the Shareholders named therein
(whether directly or by joinder agreement), as amended from time to time, and
(ii) any legal successor-in-interest to or any Transferee of any Person referred
to in clause (i) of this definition that is required to become a party to the
Shareholders Agreement by reason of Section 11(a) of the First Amendment.
“1934 Act Registration” means the registration of the Common Stock by the
Company under the 1934 Act.
     3. Amendment to Section 3.02. Section 3.02 of the Shareholders Agreement is
hereby amended and restated in its entirety as follows:
          “Subject to all applicable laws, the restrictions on Transfer set
forth in Section 3.01 hereof shall not apply to any of the following:

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(a) a Transfer by a Shareholder of Common Stock (other than Distributed Shares
prior to the 1934 Act Registration) to one of its Permitted Transferees;
provided that such Permitted Transferee shall agree to execute a Joinder
Agreement in the form annexed hereto as Exhibit A (the “Joinder Agreement”);
(b) a Transfer of Common Stock (other than Distributed Shares prior to the 1934
Act Registration) by a Shareholder in accordance with Sections 4.02 and 4.03 of
this Agreement;
(c) a Transfer by a Shareholder of Common Stock (other than Distributed Shares
prior to the 1934 Act Registration) after such Shareholder has complied with
Section 4.01; provided that the Transferee shall agree to execute a Joinder
Agreement;
(d) a Transfer of Common Stock by a Shareholder pursuant to an effective
registration statement under the 1933 Act or a Transfer of Common Stock (other
than Distributed Shares prior to the 1934 Act Registration) pursuant to Rule 144
under the 1933 Act;
(e) a Transfer by MCLLC in connection with the issuance of a Convertible
Security as contemplated by Section 6.16; provided that the recipient of such
Convertible Security agrees to execute a Joinder Agreement as described in
Section 6.16;
(f) Transfers by MCLLC and Metaldyne pursuant to a Metaldyne Distribution;
provided that, if such Transfer is to Metaldyne Shareholders prior to the 1934
Act Registration, provision shall be made to ensure that subsequent Transfers of
Distributed Shares shall only be made, prior to the 1934 Act Registration, by
Metaldyne Shareholders to Limited Permitted Transferees of such Metaldyne
Shareholder; and
(g) following a Metaldyne Distribution and prior to the 1934 Act Registration, a
Transfer by a Metaldyne Shareholder of Distributed Shares to Limited Permitted
Transferees of such Metaldyne Shareholder.
     4. Amendment of Section 4.01. Section 4.01(a) of the Shareholders Agreement
is hereby amended by (i) deleting the phrase “Section 3.02(a), 3.02(d), 4.02 or
4.03” and replacing it in its entirety with “Section 3.02(a), 302(d), 3.02(g),
4.02 or 4.03” and (ii) adding the following to the end of that section:
“Notwithstanding anything to the contrary

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herein, this Section 4.01 (including, without limitation, the provisions of the
second paragraph of Section 4.01(c)) shall be inapplicable to the Metaldyne
Distribution itself.”
     5. Amendment of Section 4.02(a). Section 4.02(a) of the Shareholders
Agreement is hereby amended by (i) deleting the phrase “Section 3.02(a),
3.02(d), 5.01 or 5.02” and replacing it in its entirety with “Section 3.02(a),
3.02(d), 3.02(g), 5.01 or 5.02” and (ii) adding the following to the end of last
sentence thereof: “provided that, for the avoidance of doubt, the provisions of
this last sentence shall not apply to Transfers of Distributed Shares received
by the Sponsor Transferor.”
     6. Amendment of Section 4.03. Section 4.03 of the Shareholders Agreement is
hereby amended by adding the following to the end of first sentence thereof:
“provided, further, that, for the avoidance of doubt, the second proviso of this
sentence shall cease to apply following the Metaldyne Distribution.”
     7. Amendment of Section 4.04. (a) Section 4.04(b) of the Shareholders
Agreement is hereby amended by deleting the beginning thereof through but not
including “(1)” and replacing it in its entirety with the following: “In the
case of (x) any Shareholder (other than MCLLC) prior to the occurrence of a
Qualifying Public Equity Offering, and for so long as such Shareholder owns
twenty-five percent (25%) of the number of shares of Common Stock (as adjusted
for Adjustments) owned by such Shareholder (in the case of any Shareholder other
than a Metaldyne Shareholder Party, as of the date of the amendment and
restatement hereof or, in the case of any Metaldyne Shareholder Party, as of and
after giving effect to the Metaldyne Distribution) or (y) MCLLC, for so long as
MCLLC owns twenty-five percent (25%) of the number of shares of Common Stock (as
adjusted for Adjustments) owned by MCLLC immediately following the Transactions,
the Company shall deliver the following to each such Shareholder and MCLLC:”
          (b) Section 4.04(b) shall be amended by the addition of the following
at the end thereof: “Notwithstanding the foregoing and the last sentence of
Section 4.04(c), the information available under Section 4.04(b) (2) and
(3) shall not be made available to a Metaldyne Shareholder Party if the Company
is filing annual, quarterly and current reports under the 1934 Act (unless it
would otherwise be entitled to such information as a Shareholder apart from the
Metaldyne Distribution).”
          (c) Section 4.04(e) shall be amended by the addition of the following
language at the end thereof: “Each Shareholder acknowledges that trading in
securities of the Company and its Subsidiaries on the basis of material
non-public information received under this Agreement may constitute a violation
of United States Federal securities laws and agrees to act to ensure compliance
with such laws.”

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     8. Amendment of Section 4.06. (a) Section 4.06(a) of the Shareholders
Agreement is hereby amended by the addition of the following at the end thereof:
“(e) For the avoidance of doubt, Section 4.06(a)(ii)(2) and (3), the proviso to
Section 4.06(a)(iv), Section 4.06(b) and Section 4.06(d) shall have no further
effect following the occurrence of the Metaldyne Distribution.”
     9. Amendment of Section 4.07. Upon the occurrence any Metaldyne
Distribution, the proviso to the penultimate sentence of Section 4.07 shall be
deleted.
     10. Amendment of Sections 5.01, 5.02 and 5.07. (a) Section 5.01(a) of the
Shareholders Agreement is hereby amended by the addition of the following at the
end thereof: “Notwithstanding anything herein to the contrary, and for the
avoidance of doubt, no Metaldyne Shareholder shall become entitled to rights
pursuant to this Section 5.01 by reason of receiving Distributed Shares in the
Metaldyne Distribution, except that Affiliates of the Company that receive
Distributed Shares shall be entitled to the registration rights afforded to a
“Shareholder” pursuant to this Section 5.01 in respect of such Distributed
Shares, in addition to such rights as may otherwise exist under Article V in
favor of such Affiliate.”
          (b) Section 5.02(a) shall be amended by the addition of the following
at the end thereof: “Notwithstanding anything herein to the contrary, and for
the avoidance of doubt, no Metaldyne Shareholder shall become entitled to rights
pursuant to this Section 5.02 by reason of receiving Distributed Shares in the
Metaldyne Distribution, except for Sponsor and its Direct Permitted Transferees
in their capacity as Demand Holders.”
          (c) Each Metaldyne Shareholder Party agrees that, regardless of
whether or not Distributed Shares held by it are Registrable Securities, such
shares shall be subject to the holdback agreements of Section 5.07 as though
they were Registrable Securities solely for purposes of any Initial Public
Offering.
     11. Addition of Section 6.17. The Shareholders Agreement is hereby amended
by adding the following section:
          “Section 6.17. Metaldyne Distribution.
          (a) Notwithstanding any provision of this Agreement, MCLLC and
Metaldyne may effect any Metaldyne Distribution; provided that (i) no recipient
of Distributed Shares will thereby become entitled to the rights and benefits
of, or be subject to the obligations and burdens under, this Agreement that are
specifically ascribed to MCLLC and (ii) the only Persons that will become
entitled to rights and be subject to obligations hereunder as a result of the
Metaldyne Distribution will be the Metaldyne Shareholder Parties by reason of
their execution of the First Amendment or of a Joinder Agreement. For the sake
of clarity, it is agreed

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that, other than in the case of the Metaldyne Shareholder Parties, recipients of
Distributed Shares pursuant to the Metaldyne Distribution need not sign a
Joinder Agreement.
          (b) Notwithstanding any provision to the contrary contained in this
Agreement and for the sake of clarity, each Metaldyne Shareholder Party agrees
that, following a Metaldyne Distribution and prior to the 1934 Act Registration,
Transfers of Distributed Shares shall only be made to Limited Permitted
Transferees and MCLLC shall take and cause Metaldyne to take all reasonably
necessary action to ensure such.
          (c) The Company agrees to cooperate and take all such actions as may
be required to ensure compliance with applicable United States Federal and state
securities laws in connection with the foregoing, including, without limitation,
the Company agrees to file a registration statement on Form 10 (or any successor
form) with respect to the registration of the Common Stock under the 1934 Act
Registration and to use best efforts to cause such registration statement to be
declared effective by the Commission not later than 120 days following the end
of the year which the Metaldyne Distribution shall have occurred.
     12. Covenants, Representations and Warranties of MCLLC and Metaldyne
Shareholder Parties. (a) Each Metaldyne Shareholder Party hereby agrees that, as
a condition to any Transfer of shares of common stock of Metaldyne prior to the
completion of the Metaldyne Distribution, it shall cause the Transferee to
execute a Joinder Agreement to the Shareholders Agreement to become a Metaldyne
Shareholder Party (if it is not already a party to the Shareholders Agreement).
          (b) Each of the Metaldyne Shareholder Parties hereby severally makes
to the Company the representations and warranties set forth in Sections 2.01
(“Authority; Enforceability”), 2.02 (“No Breach”) and Section 2.03(a)
(“Consents”) solely with respect to the execution, delivery and performance of
this Amendment and the matters contemplated hereby.
          (c) Each Metaldyne Shareholder Party hereby agrees and authorizes the
Company to act as a custodian to hold any Distributed Shares prior to the 1934
Act Registration to ensure compliance with United States Federal securities laws
and acknowledges that Metaldyne has agreed to deliver any Distributed Shares to
the Company for that purpose. In addition, the Company is authorized to retain
such shares for the duration of any lock-up or hold back period consistent with
Section 10(c) of this Amendment if 1934 Act Registration occurs in connection
with an Initial Public Offering.
          (d) The Company hereby agrees with Metaldyne that it will not effect
transfers of Common Stock in the stock ledger of the Company or issue new
certificates in connection with any such transfers, other than in compliance
with all Regulatory Requirements and this Shareholders Agreement.

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          (e) The Distributed Shares will contain the following legend,
notwithstanding Section 3.04, and MCLLC and the Company shall cooperate to
ensure that, prior to the Metaldyne Distribution, all Distributed Shares,
whether or not subject to the Shareholders Agreement will bear the following
legend:
     THE SECURITIES REPRESENTED BY THIS CERTIFICATE MAY NOT BE OFFERED OR SOLD
PRIOR TO THE REGISTRATION OF THE CLASS OF THE SECURITIES UNDER THE UNITED STATES
SECURITIES ACT OF 1934 EXCEPT TO (A) WITH RESPECT TO ANY SHAREHOLDER THAT IS A
NATURAL PERSON, (I) THE SPOUSE OR ANY LINEAL DESCENDANT (INCLUDING BY ADOPTION
OR STEPCHILDREN) OF SUCH SHAREHOLDER OR ANY TRANSFEREE OF SUCH SHAREHOLDER BY
OPERATION OF LAWS OF DESCENT, (II) ANY TRUST OF WHICH SUCH SHAREHOLDER IS THE
TRUSTEE AND WHICH IS ESTABLISHED SOLELY FOR THE BENEFIT OF ANY OF THE FOREGOING
INDIVIDUALS AND (III) ANY PARTNERSHIP, ALL OF THE GENERAL PARTNER(S) AND LIMITED
PARTNER(S) (IF ANY) OF WHICH ARE ONE OR MORE PERSONS IDENTIFIED IN THE PRECEDING
CLAUSE (I) AND (B) WITH RESPECT TO ANY OTHER PERSON, AN AFFILIATE OF SUCH
PERSON.
          Distributed Shares subject to the Shareholders Agreement shall also
bear the following legend:
     THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE ALSO SUBJECT TO THE
TERMS AND CONDITIONS, INCLUDING WITH RESPECT TO THE DIRECT OR INDIRECT TRANSFER
THEREOF, OF A SHAREHOLDERS AGREEMENT DATED AS OF JUNE 6, 2002, AS AMENDED AND
RESTATED AS OF JULY 19, 2002 AND AS AMENDED ON AUGUST 31, 2006 (AS AMENDED,
AMENDED AND RESTATED, MODIFIED OR SUPPLEMENTED FROM TIME TO TIME, THE
“SHAREHOLDERS AGREEMENT”). THE SHAREHOLDERS AGREEMENT CONTAINS, AMONG OTHER
THINGS, SIGNIFICANT RESTRICTIONS ON TRANSFER OF THE SECURITIES OF THE COMPANY. A
COPY OF THE SHAREHOLDERS AGREEMENT IS AVAILABLE UPON REQUEST FROM THE COMPANY.
     13. Provisions of General Application. Except as otherwise expressly
provided by this Amendment, all of the terms, conditions and provisions to the
Shareholders Agreement remain unaltered. The Shareholders Agreement and this
Amendment shall be read and construed as one agreement. If any of the terms of
this Amendment shall conflict in any respect with any of the terms of the
Shareholders Agreement, the terms of this Amendment shall be controlling.

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     14. Counterparts; Effectiveness; Captions. This Amendment may be signed in
any number of counterparts, each of which shall be an original, with the same
effect as if the signatures thereto and hereto were upon the same instrument.
The captions of this Amendment are included for convenience of reference only,
do not constitute a part hereof and shall be disregarded in the construction
hereof.
     15. GOVERNING LAW. THIS AMENDMENT SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO THE
PRINCIPLES OF CONFLICTS OF LAWS.
     16. Entire Agreement. This Amendment constitutes the full and entire
understanding and agreement between the parties hereto with respect to the
subject matter hereof and supersedes all prior negotiations, understandings and
agreements between such parties in respect of such subject matter.

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     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed as of the day and year first above written.

            TRIMAS CORPORATION
    Date: August 31, 2006  By:   /s/ [ILLEGIBLE]         Name:          
Title:        

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                  HIP SIDE-BY-SIDE PARTNERS, L.P.    
 
           
 
  By:   HEARTLAND INDUSTRIAL ASSOCIATES, L.L.C.    
 
  Its:   General Partner    
 
           
 
  By:   /s/ [Illegible]    
 
     
 
Name:    
 
      Title:    

Amendment to TriMas Shareholders Agreement

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            METALDYNE COMPANY LLC
      By:   /s/ [Illegible]       Name:           Title:        

Amendment to TriMas Shareholders Agreement

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                  MESIROW CAPITAL PARTNERS VIII, L.P.    
 
           
 
  by   Mesirow Financial Services, Inc., its General Partner    
 
           
 
  by   /s/ Thomas E. Galuhn    
 
     
 
Name: Thomas E. Galuhn    
 
      Title: Sr. Managing Director    

Amendment to TriMas Shareholders Agreement

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                  MESIROW CAPITAL PARTNERS VIII, L.P.    
 
           
 
  by   Mesirow Financial Services, Inc., its General Partner    
 
           
 
  by   /s/ Thomas E. Galuhn    
 
     
 
Name: Thomas E. Galuhn    
 
      Title: Sr. Managing Director    

Amendment to TriMas Shareholders Agreement

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            TRIMAS INVESTMENT FUND I, L.L.C.
      By:   /s/ [Illegible]       Name:           Title:        

Amendment to TriMas Shareholders Agreement

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            TRIMAS INVESTMENT FUND I, L.L.C.
      By:   /s/ [Illegible]       Name:           Title:        

Amendment to TriMas Shareholders Agreement

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MASCO CAPITAL CORPORATION
      By:   /s/ Peter A. Dow         Name:           Title:        

Amendment to TriMas Shareholders Agreement

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            CRAIG MANCHEN
      By:   /s/Craig Manchen         Name:         Title:  Shareholder     

Amendment to TriMas Shareholders Agreement

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            GE CAPITAL EQUITY INVESTMENTS, INC.
      By:   /s/ [Illegible]       Name:           Title:        

Amendment to TriMas Shareholders Agreement

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            METALDYNE INVESTMENT FUND I, LLC
      By:   /s/ [Illegible]       Name:           Title:        

Amendment to TriMas Shareholders Agreement

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            METALDYNE INVESTMENT FUND II, LLC
      By:   /s/ [Illegible]       Name:           Title:        

Amendment to TriMas Shareholders Agreement

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                  CREDIT SUISSE FIRST BOSTON EQUITY PARTNERS, L.P.    
 
           
 
  By:   Hemisphere Private Equity Partners, Ltd., Its General Partner    
 
           
 
  By:   /s/Kenneth Lohsen    
 
     
 
Name:   Kenneth Lohsen    
 
      Title: Attorney-in-Fact    

Amendment to TriMas Shareholders Agreement

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                  CREDIT SUISSE FIRST BSTON EQUITY PARTNERS (BERMUDA), L.P.    
 
           
 
  By:   Hemisphere Private Equity Partners, Ltd., Its General Partner    
 
           
 
  By:   /s/Kenneth Lohsen    
 
     
 
Name:   Kenneth Lohsen    
 
      Title: Attorney-in-Fact    

Amendment to TriMas Shareholders Agreement

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                      CREDIT SUISSE FIRST BOSTON FUND INVESTMENTS VI HOLDINGS,
LLC    
 
                    By:   Credit Suisse First Boston Fund Investments VI, L.P.,
Its Managing Member    
 
                    By:   Credit Suisse First Boston Fund Investments VI — Side
Partnership, L.P., Its Managing Member    
 
                    By:   Credit Suisse First Boston fund Investments VI
(Bermuda), L.P., Its Managing Member    
 
               
 
      By:   Merchant Capital, Inc., the General Partner of the foregoing
entities    
 
                    By:   /s/Kenneth Lohsen                  
 
      Name:   Kenneth Lohsen    
 
      Title:   Vice President    

Amendment to TriMas Shareholders Agreement

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                  CREDIT SUISSE FIRST BOSTON FUND INVESTMENTS VI-B (BERMUDA),
L.P.    
 
           
 
  By:   Merchant Capital, Inc., Its General Partner    
 
           
 
  By:   /s/Kenneth Lohsen    
 
     
 
Name:  Kenneth Lohsen    
 
      Title:    Vice President    

Amendment to TriMas Shareholders Agreement

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                  CREDIT SUISSE FIRST BOSTON U.S. EXECUTIVE ADVISORS, L.P.    
 
           
 
  By:   Hemisphere Private Equity Partners, Ltd., Its General Partner    
 
           
 
  By:   /s/ Kenneth Lohsen    
 
     
 
Name:  Kenneth Lohsen    
 
      Title:    Attorney-in-Fact    

Amendment to TriMas Shareholders Agreement

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            MASCO CORPORATION
      By:   /s/Peter A. Dow         Name:   Peter A. Dow        Title:        

Amendment to TriMas Shareholders Agreement

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            RICHARD AND JANE MANOOGIAN FOUNDATION
      By:   /s/Richard A. Manoogian         Name:   Richard A. Manoogian       
Title:   President and Treasurer     

Amendment to TriMas Shareholders Agreement

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            RICHARD MANOOGIAN
      By:   /s/Richard A. Manoogian         Name:   Richard A. Manoogian       
Title:        

Amendment to TriMas Shareholders Agreement

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            WACHOVIA CAPITAL PARTNERS 2000, LLC
(formerly First Union Capital Partners, LLC)
      By:   /s/ [Illegible]       Name:           Title:   Vice President     

Amendment to TriMas Shareholders Agreement

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            BANCBOSTON CAPITAL INC.
      By:   /s/ [Illegible]       Name:           Title:   Vice President     

Amendment to TriMas Shareholders Agreement

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            METROPOLITAN LIFE INSURANCE COMPANY
      By:   /s/Christopher Farrington         Name:   Christopher Farrington   
    Title:   Director     

Amendment to TriMas Shareholders Agreement

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            EQUITY ASSET INVESTMENT TRUST
      By:   /s/ [Illegible]       Name:          Title: Attorney-in-Fact     

Amendment to TriMas Shareholders Agreement

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                  ANNEX HOLDINGS I LP    
 
           
 
  By:   Annex Capital Partners LLC, its General Partner    
 
           
 
  By:   /s/Alexander P. Coleman    
 
  Name:  
 
Alexander P. Coleman    
 
  Title:   MANAGING MEMBER OF THE GENERAL PARTNER    

Amendment to TriMas Shareholders Agreement

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            LONGPOINT CAPITAL FUND, L.P.
      By:   /s/ Gerard Boylan         Name:           Title:        

Amendment to TriMas Shareholders Agreement

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            LONGPOINT CAPITAL PARTNERS, L.L.C.
      By:   /s/Gerard Boylan         Name:           Title:        

Amendment to TriMas Shareholders Agreement

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                  EMA PARTNERS FUND 2000, L.P.    
 
           
 
  By:   Credit Suisse (Bermuda) Limited, Its General Partner    
 
           
 
  By:   /s/Kenneth Lohsen    
 
  Name:  
 
Kenneth Lohsen    
 
  Title:   Vice President    

Amendment to TriMas Shareholders Agreement

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                  EMA PARTNERS EQUITY FUND 2000, L.P.    
 
           
 
  By:   Credit Suisse (Bermuda) Limited, Its General Partner    
 
           
 
  By:   /s/Kenneth Lohsen    
 
  Name:  
 
Kenneth Lohsen    
 
  Title:   Vice President    

Amendment to TriMas Shareholders Agreement

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                      75 WALL STREET ASSOCIATES LLC        
 
                    By:   Allianz Leben Private Equity Funds Plus GmbH    
 
  Its:   Members        
 
               
 
  By:   /s/Wancfing Aug   Claus Zeilner                  
 
      Name: Wancfing Aug   Claus Zeilner    
 
      Title:   Managing Director   Director    
 
                    By:   Alliance Private Equity Partners, Inc.    
 
  Its:   Adviser        
 
               
 
  By:   /s/Arthur Ebersole   Brian Welker                  
 
      Name: Arthur Ebersole   Brian Welker    
 
      Title:   Vice President   Vice President    

Amendment to TriMas Shareholders Agreement

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                  GRAHAM PARTNERS INVESTMENTS, L.P.    
 
           
 
  By:   GRAHAM PARTNERS GENERAL PARTNER, L.P.    
 
  Its:   General Partner    
 
           
 
  By:   GRAHAM PARTNERS INVESTMENTS (GP2), L.P.    
 
  Its:   General Partner    
 
           
 
  By:   GRAHAM PARTNERS INVESTMENTS (GP), LLC    
 
  Its:   General Partner    
 
           
 
  By:   /s/Steven C. Graham    
 
     
 
Name:  Steven C. Graham    
 
      Title:    Managing Member    

Amendment to TriMas Shareholders Agreement

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                  GRAHAM PARTNERS INVESTMENTS (A), L.P.    
 
           
 
  By:   GRAHAM PARTNERS GENERAL PARTNER, L.P.    
 
  Its:   General Partner    
 
           
 
  By:   GRAHAM PARTNERS INVESTMENTS (GP2), L.P.    
 
  Its:   General Partner    
 
           
 
  By:   GRAHAM PARTNERS INVESTMENTS (GP), LLC    
 
  Its:   General Partner    
 
           
 
  By:   /s/Steven C. Graham    
 
     
 
Name:  Steven C. Graham    
 
      Title:    Managing Member    

Amendment to TriMas Shareholders Agreement

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            PRIVATE EQUITY PORTFOLIO FUND II, LLC
      By:   /s/Matthew J. Ahern         Name:   Matthew J. Ahern        Title:  
Vice President     

Amendment to TriMas Shareholders Agreement

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            CRM 1999 ENTERPRISE FUND, LLC
      By:   /s/Carlos Leal         Name:   Carlos Leal        Title:   CFO of
Managing Member     

Amendment to TriMas Shareholders Agreement

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  HEARTLAND INDUSTRIAL PARTNERS, L.P.    
 
           
 
  By:   Heartland Industrial Associates L.L.C., its General Partner    
 
           
 
  By:   /s/Daniel P. Tredwell    
 
     
 
Name:    Daniel P. Tredwell    
 
      Title:    

Amendment to TriMas Shareholders Agreement

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EXHIBIT A
JOINDER AGREEMENT
     WHEREAS, the undersigned is acquiring simultaneously with the execution of
this Agreement common stock (the “Common Stock”), par value $0.01 per share of
TriMas Corporation (the “Company”); and
     WHEREAS, as a condition to the acquisition of the Common Stock, the
undersigned has agreed to join in a certain Shareholders Agreement (the
“Shareholders Agreement”) dated as of June 6, 2002 and amended and restated as
of July 19, 2002 among TriMas Corporation and the Shareholders (as such term is
defined in the Shareholders Agreement); and
     WHEREAS, the undersigned understands that execution of this Agreement is a
condition precedent to the acquisition of the Common Stock;
     NOW, THEREFORE, as an inducement to both the transferor of the Common Stock
and the other Shareholders (as such term is defined in the Shareholders
Agreement), to Transfer (as such term is defined in the Shareholders Agreement)
and to allow the Transfer of the Common Stock to the undersigned, the
undersigned agrees as follows:

  1.   The undersigned hereby joins in the Shareholders Agreement and agrees to
be bound by the terms and provisions of the Shareholders Agreement as provided
by the Shareholders Agreement.     2.   The undersigned hereby consents that the
certificate or certificates to be issued to the undersigned representing the
Common Stock shall be legended as follows:         “THE SERCUITIES REPRESENTED
BY THIS CERTIFICATE MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO (i) AN
EFFECTIVE REGISTRATION STATEMENT UNDER THE UNITED STATES SECURITIES ACT OF 1933,
AS AMENDED, OR (ii) AN APPLICABLE EXEMPTION FROM REGISTRATION THEREUNDER. ANY
SALE PURSUANT TO CLAUSE (ii) OF THE PRECEDING SENTENCE MUST BE ACCOMPANIED BY AN
OPINION OF COUNSEL REASONABLY SATISFCTORY TO THE COMPANY TO THE EFFECT THAT SUCH
EXEMPTION FROM REGISTRATION IS AVAILABLE IN CONNECTION WITH SUCH SALE.        
THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE ALSO SUBJECT TO THE TERMS AND
CONDITIONS, INCLUDING WITH RESPECT TO THE DIRECT OR INDIRECT TRANSFER THEREOF,
OF A

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      SHAREHOLDERS AGREEMENT DATED AS OF JUNE 6, 2002, AS AMENDED AND RESTATED
AS OF JULY 19, 2002. THE SHAREHOLDERS AGREEMENT CONTAINS, AMONG OTHER THINGS,
SIGNIFICANT RESTRICTIONS ON TRANSFER OF THE SECURITIES OF THE COMPANY. A COPY OF
THE SHAREHOLSERS AGREEMENT IS AVAILABLE UPON REQUEST FROM THE COMPANY.”

     INWITNESS WHEREOF, the undersigned has executed this Agreement this
                     day of                     , 20             .

         
 
 
 
Name:    
 
  Title:    
 
  Address: