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Author Message   Michael_linn Tinkerer Username: Michael_linn Post Number: 91 Registered: 04-2011 Rating: N/A Votes: 0 Posted on Saturday, July 20, 2013 - 01:27 pm:    It's usually the fifty year old lubrication in the shutter and release train. The camera needs to be disassembled, cleaned, and re-lubed.