**Exhibit 31.1****Certification of Chief Executive Officer**I, Michael L. Hurt, certify that:1. I have reviewed this annual report on Form 10-K of Altra Industrial Motion, Inc.;2. Based on my knowledge, this annual report does not contain any untrue statement of a materialfact or omit to state a material fact necessary in order to make the statements made, in light ofthe circumstances under which such statements were made, not misleading with respect to the periodcovered by this report;3. Based on my knowledge, the financial statements, and other financial information included inthis annual report, fairly present in all material respects the financial condition, results ofoperations and cash flows of the registrant as of, and for, the periods presented in this report;4. The registrant’s other certifying officer and I are responsible for establishing and maintainingdisclosure controls and procedures (as defined in Exchange Act rules 13a-15(e) and 15d-15(e)) forthe registrant and have:a) designed such disclosure controls and procedures, or caused such disclosure controls andprocedures to be designed under our supervision, to ensure that material informationrelating to the registrant, including its consolidated subsidiaries, is made known to us byothers within those entities, particularly during the period in which this report is beingprepared;b) evaluated the effectiveness of the registrant’s disclosure controls and procedures andpresented in this report our conclusions about the effectiveness of the controls andprocedures, as of the end of the period covered by this report based on such evaluation;andc) disclosed in this report any change in the registrant’s internal control over financialreporting that occurred during the registrant’s year ended December 31, 2006 that hasmaterially affected, or is reasonably likely to materially affect, the registrant’sinternal control over financial reporting; and5. The registrant’s other certifying officer and I have disclosed, based on our most recentevaluation of internal control over financial reporting, to the registrant’s auditors and the auditcommittee of registrant’s board of directors (or persons performing the equivalent functions):a) all significant deficiencies and material weaknesses in the design or operation ofinternal control over financial reporting which are reasonably likely to adversely affectthe registrant’s ability to record, process, summarize and report financial information;andb) any fraud, whether or not material, that involves management or other employees whohave a significant role in the registrant’s internal control over financial reporting.6. This annual report does not include an attestation report of the registrant’s registered publicaccounting firm regarding internal control over financial reporting. Management’s report was notsubject to attestation by the registrant’s registered public accounting firm pursuant to temporaryrules of the Securities and Exchange Commission that permit the registrant to provide onlymanagement’s report in this annual report.       Date:March 19, 2007   By: /s/ Michael L. Hurt           Name: Michael L. Hurt    Title: Chairman and      Chief Executive Officer