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Exhibit 4.12.1 AMENDMENT NO. 1 This AMENDMENT No. 1 dated as of June 30, 2004 (Amendment No.1), is entered into by
and among DAYTON SUPERIOR CORPORATION, an Ohio corporation (Borrower), the persons
designated as Credit Parties on the signature pages hereto, the persons designated as Lenders
on the signature pages hereto, and GENERAL ELECTRIC CAPITAL CORPORATION, a Delaware corporation, as
Agent. WHEREAS, Borrower, the other Credit Parties, the Lenders (as defined therein) and Agent are
party to the Credit Agreement dated as of January 30, 2004 (Original Credit Agreement;
all capitalized terms defined in the Original Credit Agreement and not otherwise defined herein to
have the meanings assigned thereto in the Original Credit Agreement or in Annex A thereto);
and WHEREAS, Borrower has requested that the Original Credit Agreement be amended in the manner
set forth below. NOW, THEREFORE, in consideration of the premises and the agreements, provisions and covenants
herein contained, Borrower, Credit Parties, the Lenders and Agent agree as follows: SECTION 1.AMENDMENTS Subject to the satisfaction of the conditions to effectiveness referred to in Section 2 below,
the Original Credit Agreement is hereby amended as follows: (a) Section 1.3(a) of the Original Credit Agreement is amended by replacing the date
November 10, 2003 appearing therein with the date June 30, 2004. (b) Section 4.9(e)(iii) of the Original Credit Agreement is amended by replacing the
word once appearing in the third line of such section with the word twice. (c) Annex A of the Original Credit Agreement is amended as follows: (i) The definition of Commitments is amended by replacing the phrase eighty million
dollars ($80,000,000) appearing therein with the phrase ninety five million dollars
($95,000,000). (ii) The definition of Revolving Loan Commitment is amended by replacing the phrase
eighty million dollars ($80,000,000) appearing therein with the phrase ninety five million
dollars ($95,000,000). (d) Annex B to the Original Credit Agreement is amended and restated as set forth on
Schedule A hereto.




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SECTION 2. CONDITIONS TO EFFECTIVENESS
 This Amendment No. 1 shall become effective on July 2, 2004 (the Effective Date) in
the event that on or prior to such date: (a) Agent shall have received one or more counterparts of this Amendment No. 1 executed and
delivered by Borrower, the other Credit Parties, Agent and Lenders; (b) Agent shall have received a legal opinion, in form and substance satisfactory to Agent,
from Latham & Watkins LLP, as to such matters relative to the authorization, execution and delivery
o this Amendment No. 1, including, without limitation, that the incurrence by Borrower of Revolving
Loans to the extent of the Revolving Loan Commitments, as increased by this Amendment No. 1, is
permitted under each of the Senior Notes Indenture and Senior Subordinated Notes Indenture, as
Agent shall have requested; (c) Agent shall have received that certain fee letter, dated as of June 30, 2004, between
Borrower and Agent, in the form attached hereto as Exhibit A, executed and delivered by Borrower
and Agent; and (d) there shall be no continuing Default or Event of Default and the representations and
warranties of Borrower contained in this Amendment No. 1 shall be true and correct in all material
respects. SECTION 3.LIMITATION ON SCOPE Except as expressly amended hereby, all of the representations, warranties, terms, covenants
and conditions of the Loan Documents shall remain in full force and effect in accordance with their
respective terms. The amendments set forth herein shall be limited precisely as provided for
herein and shall not be deemed to be waivers of, amendments of, consents to or modifications of any
term or provision of the Loan Documents or any other document or instrument referred to therein or
of any transaction or further or future action on the part of Borrower or any other Credit Party
requiring the consent of Agent or Lenders except to the extent specifically provided for herein.
Agent and Lenders have not and shall not be deemed to have waived any of their respective rights
and remedies against Borrower or any other Credit Party for any existing or future Defaults or
Event of Default. SECTION 4.MISCELLANEOUS (a) Borrower hereby represents and warrants as follows: (i) this Amendment No. 1 has been duly authorized and executed by Borrower and each other
Credit Party, and the Original Credit Agreement, as amended by this Amendment No. 1, is the legal,
valid and binding obligation of Borrower and each other Credit Party that is a party thereto,
enforceable in accordance with its terms, except as such enforceability may be limited by
applicable bankruptcy, moratorium and similar laws affecting the rights of creditors in general;
and 2




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(ii) Borrower repeats and restates the representations and warranties of Borrower contained in
the Original Credit Agreement as of the date of this Amendment No. 1 and as of the Effective Date,
except to the extent such representations and warranties relate to a specific date. (b) This Amendment No. 1 is being delivered in the State of New York. (c) Borrower and the other Credit Parties hereby ratify and confirm the Original Credit
Agreement as amended hereby, and agree that, as amended hereby, the Original Credit Agreement
remains in full force and effect. (d) Borrower and the other Credit Parties agree that all Loan Documents to which each such
Person is a party remain in full force and effect notwithstanding the execution and delivery of
this Amendment No. 1. (e) This Amendment No. 1 may be executed by the parties hereto in separate counterparts, each
of which when so executed and delivered shall be deemed an original, but all of which counterparts
together shall constitute but one and the same instrument. (f) All references in the Loan Documents to the Credit Agreement and in the Original Credit
Agreement as amended hereby to this Agreement, hereof, herein or the like shall mean and
refer to the Original Credit Agreement as amended by this Amendment No. 1 (as well as by all
subsequent amendments, restatements, modifications and supplements thereto). (g) Each of the following provisions of the Original Credit Agreement is hereby incorporated
herein by this reference with the same effect as though set forth in its entirety herein, mutatis
mutandis, and as if this Agreement in any such provision read this Amendment No. 1: Section 9.3
(Notices), Section 9.6, (Severability), Section 9.8 (Headings), Section 9.9 (Applicable Law),
Section 9.12 (Construction), Section 9.15 (Waiver of Jury Trial) and Section 9.17 (Entire
Agreement). [signature pages follow] 3




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WITNESSthe due execution hereof by the respective duly authorized officers of the undersigned as
of the date first written above. BORROWER:
DAYTON SUPERIOR CORPORATIONBy:
    /s/ Edward J. PuisisName:
    Edward J. PuisisVice President and Chief Financial Officer CREDIT PARTIES:
AZTEC CONCRETE ACCESSORIES, INC.By:
    /s/ Edward J. PuisisName:
    Edward J. PuisisVice President and Chief Financial Officer DAYTON SUPERIOR SPECIALTY CHEMICAL CORP.By:
    /s/ Edward J. PuisisName:
    Edward J. PuisisVice President and Chief Financial Officer DUR-O-WAL, INC.By:
    /s/ Edward J. PuisisName:
    Edward J. PuisisVice President and Chief Financial Officer SOUTHERN CONSTRUCTION PRODUCTS, INC.By:
    /s/ Edward J. PuisisName:
    Edward J. PuisisVice President and Chief Financial Officer SYMONS CORPORATIONBy:
    /s/ Edward J. PuisisName:
    Edward J. PuisisVice President and Chief Financial Officer Dayton Amendment No. 1




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TREVECCA HOLDINGS, INC.By:
    /s/ Edward J. PuisisName:
    Edward J. PuisisVice President and Chief Financial Officer AGENT AND LENDERS:

GENERAL ELECTRIC CAPITAL CORPORATION,
as Agent, an L/C Issuer and a LenderBy:
    /s/ Sandra ClaghornName:
    Sandra ClaghornSenior Vice President GMAC COMMERCIAL FINANCE LLC,
as a LenderBy:
    /s/ Robert J. BrandowName:
    Robert J. BrandowDirector Dayton Amendment No. 1




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Schedule A ANNEX B (from Annex A - Commitments definition)
to
CREDIT AGREEMENT PRO RATA SHARES AND COMMITMENT AMOUNTS Lender(s)Revolving Loan Commitment$47,500,000(including a Swing Line Commitmentof $8,000,000)
    
    General Electric Capital CorporationRevolving Loan Commitment$47,500,000
    
    GMAC Commercial Finance LLC
 Schedule A




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Exhibit A [Exhibit intentionally omitted]  Exhibit A