Eccentric cam rotates inside the transmission in order to adjust the tension of the belt.
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Used this part on a straight shaft 7g kit from another site , theirs was poorly machined and allowed the pulley to wobble, this was a tight fit and well made. It was .5 inches longer than my 7g part . I cut .5 inches out and re welded the back plate on and now it works excellently. Available nowhere else.