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Author Message   Lucas Tinkerer Username: Lucas Post Number: 107 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Sunday, November 28, 2010 - 04:43 am:    It is an excenter milled into the base plate of the locking arm arm forced over by the lever. If back is not locking it is most likely the stud on the front of the camera that is broken off or worn, the little upright part in the locking arm that is bent ( no longer at 90 degree angle to arm) or a combination of both.