Exhibit 25.1

FORM T-1

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

STATEMENT OF ELIGIBILITY
UNDER THE TRUST INDENTURE ACT OF 1939 OF A
CORPORATION DESIGNATED TO ACT AS TRUSTEE

CHECK IF AN APPLICATION TO DETERMINE
ELIGIBILITY OF A TRUSTEE PURSUANT TO
SECTION 305(b)(2)       o

THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.

(Exact name of trustee as specified in its charter)

	95-3571558
(State of incorporation	(I.R.S. employer
if not a U.S. national bank)	identification no.)
700 South Flower Street
Suite 500
Los Angeles, California	90017
(Address of principal executive offices)	(Zip code)

ALTRA HOLDINGS, INC.

(Exact name of obligor as specified in its charter)

Delaware	61-1478870
(State or other jurisdiction of	(I.R.S. employer
incorporation or organization)	identification no.)

Altra Industrial Motion, Inc.

(Exact name of obligor as specified in its charter)

Delaware	30-0283143
(State or other jurisdiction of	(I.R.S. employer
incorporation or organization)	identification no.)

American Enterprises MPT Corp.

(Exact name of obligor as specified in its charter)

Delaware	52-2005169
(State or other jurisdiction of	(I.R.S. employer
incorporation or organization)	identification no.)

American Enterprises MPT Holdings, LLC

(Exact name of obligor as specified in its charter)

Delaware	52-2005171
(State or other jurisdiction of	(I.R.S. employer
incorporation or organization)	identification no.)

Ameridrives International, LLC

(Exact name of obligor as specified in its charter)

Delaware	52-1826102
(State or other jurisdiction of	(I.R.S. employer
incorporation or organization)	identification no.)

Boston Gear LLC

(Exact name of obligor as specified in its charter)

Delaware	11-3723980
(State or other jurisdiction of	(I.R.S. employer
incorporation or organization)	identification no.)

Formsprag LLC

(Exact name of obligor as specified in its charter)

Delaware	01-0712538
(State or other jurisdiction of	(I.R.S. employer
incorporation or organization)	identification no.)

Inertia Dynamics, LLC

(Exact name of obligor as specified in its charter)

Delaware	20-4221420
(State or other jurisdiction of	(I.R.S. employer
incorporation or organization)	identification no.)

Kilian Manufacturing Corporation

(Exact name of obligor as specified in its charter)

Delaware	06-0933715
(State or other jurisdiction of	(I.R.S. employer
incorporation or organization)	identification no.)

Nuttall Gear LLC

(Exact name of obligor as specified in its charter)

Delaware	54-1856788
(State or other jurisdiction of	(I.R.S. employer
incorporation or organization)	identification no.)

TB Wood’s Incorporated

(Exact name of obligor as specified in its charter)

Pennsylvania	23-1232420
(State or other jurisdiction of	(I.R.S. employer
incorporation or organization)	identification no.)

TB Wood’s Corporation

(Exact name of obligor as specified in its charter)

Delaware	25-1771145
(State or other jurisdiction of	(I.R.S. employer
incorporation or organization)	identification no.)

TB Wood’s Enterprises, Inc.

(Exact name of obligor as specified in its charter)

Delaware	51-0393505
(State or other jurisdiction of	(I.R.S. employer
incorporation or organization)	identification no.)

Warner Electric LLC

(Exact name of obligor as specified in its charter)

Delaware	54-1967089
(State or other jurisdiction of	(I.R.S. employer
incorporation or organization)	identification no.)

Warner Electric Technology LLC

(Exact name of obligor as specified in its charter)

Delaware	54-1967084
(State or other jurisdiction of	(I.R.S. employer
incorporation or organization)	identification no.)

Warner Electric International Holding, Inc.

(Exact name of obligor as specified in its charter)

Delaware	54-1967086
(State or other jurisdiction of	(I.R.S. employer
incorporation or organization)	identification no.)

300 Granite Street
Suite 201
Braintree, Massachusetts	02184
(Address of principal executive offices)	(Zip code)

8¹/₈% Senior Secured Notes due 2016
and Guarantees of 8¹/₈% Senior Secured Notes due 2016
(Title of the indenture securities)

1. General information. Furnish the following information as to the trustee:

(a) Name and address of each examining or supervising authority to which it is subject.

Name	Address
Comptroller of the Currency United States Department of the Treasury	Washington, D.C. 20219
Federal Reserve Bank	San Francisco, California 94105
Federal Deposit Insurance Corporation	Washington, D.C. 20429

(b)	Whether it is authorized to exercise corporate trust powers.
	Yes.

2.	Affiliations with Obligor.
	If the obligor is an affiliate of the trustee, describe each such affiliation.
	None.

16.	List of Exhibits.
	Exhibits identified in parentheses below, on file with the Commission, are incorporated herein by reference as an exhibit hereto, pursuant to Rule 7a-29 under the Trust Indenture Act of 1939 (the “Act”) and 17 C.F.R. 229.10(d).

1.	A copy of the articles of association of The Bank of New York Mellon Trust Company, N.A., formerly known as The Bank of New York Trust Company, N.A. (Exhibit 1 to Form T-1 filed with Registration Statement No. 333-121948 and Exhibit 1 to Form T-1 filed with Registration Statement No. 333-152875).
2.	A copy of certificate of authority of the trustee to commence business. (Exhibit 2 to Form T-1 filed with Registration Statement No. 333-121948).
3.	A copy of the authorization of the trustee to exercise corporate trust powers (Exhibit 3 to Form T-1 filed with Registration Statement No. 333-152875).

-2-

4.	A copy of the existing by-laws of the trustee (Exhibit 4 to Form T-1 filed with Registration Statement No. 333-162713).
6.	The consent of the trustee required by Section 321(b) of the Act (Exhibit 6 to Form T-1 filed with Registration Statement No. 333-152875).
7.	A copy of the latest report of condition of the Trustee published pursuant to law or to the requirements of its supervising or examining authority.

-3-

SIGNATURE

     Pursuant to the requirements of the Act, the trustee, The Bank of New York Mellon Trust Company, N.A., a banking association organized and existing under the laws of the United States of America, has duly caused this statement of eligibility to be signed on its behalf by the undersigned, thereunto duly authorized, all in the City of Los Angeles, and State of California, on the 27th day of January, 2010.

THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.
By:	/S/ TERESA PETTA
	Name:	TERESA PETTA
	Title:	VICE PRESIDENT

-4-

EXHIBIT 7

Consolidated Report of Condition of
THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.
of 700 South Flower Street, Suite 200, Los Angeles, CA 90017

     At the close of business September 30, 2009, published in accordance with Federal regulatory authority instructions.

	Dollar Amounts
ASSETS	in Thousands
Cash and balances due from depository institutions:
Noninterest-bearing balances and currency and coin		1,585
Interest-bearing balances		426
Securities:
Held-to-maturity securities		16
Available-for-sale securities		553,806
Federal funds sold and securities purchased under agreements to resell:
Federal funds sold		83,000
Securities purchased under agreements to resell		0
Loans and lease financing receivables:
Loans and leases held for sale		0
Loans and leases, net of unearned income		0
LESS: Allowance for loan and lease losses		0
Loans and leases, net of unearned income and allowance		0
Trading assets		0
Premises and fixed assets (including capitalized leases)		10,983
Other real estate owned		0
Investments in unconsolidated subsidiaries and associated companies		1
Direct and indirect investments in real estate ventures		0
Intangible assets:
Goodwill		852,858
Other intangible assets		251,145
Other assets		156,398
Total assets	$	1,910,218

1

LIABILITIES

Deposits:
In domestic offices	1,712
Noninterest-bearing	1,712
Interest-bearing	0
Not applicable
Federal funds purchased and securities
sold under agreements to repurchase:
Federal funds purchased	0
Securities sold under agreements to repurchase	0
Trading liabilities	0
Other borrowed money:
(includes mortgage indebtedness and obligations under capitalized leases)	268,691
Not applicable
Not applicable
Subordinated notes and debentures	0
Other liabilities	198,124
Total liabilities	468,527
Not Applicable
EQUITY CAPITAL
Perpetual preferred stock and related surplus	0
Common stock	1,000
Surplus (exclude all surplus related to preferred stock)	1,121,520
Not Applicable
Retained earnings	316,907
Accumulated other comprehensive income	2,264
Other equity capital components	0
Not Available
Total bank equity capital	1,441,691
Noncontrolling (minority) interests in consolidated subsidiaries	0
Total equity capital	1,441,691
Total liabilities and equity capital	1,910,218

     I, Karen Bayz, Managing Director of the above-named bank do hereby declare that the Reports of Condition and Income (including the supporting schedules) for this report date have been prepared in conformance with the instructions issued by the appropriate Federal regulatory authority and are true to the best of my knowledge and belief.

     Karen Bayz     )      Managing Director

     We, the undersigned directors (trustees), attest to the correctness of the Report of Condition (including the supporting schedules) for this report date and declare that it has been examined by us and to the best of our knowledge and belief has been prepared in conformance with the instructions issued by the appropriate Federal regulatory authority and is true and correct.

Troy Kilpatrick, MD	)
Frank P. Sulzberger, MD	)	Directors (Trustees)
William D. Lindelof, MD	)

2