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Author Message   Mikel Tinkerer Username: Mikel Post Number: 129 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Wednesday, March 18, 2009 - 08:21 pm:    On the FR's there is an air damper piston for the mirror on the rewind side of the shutter box. It was lubricated when the camera was manufactured, but might now be sticking. If that is the problem (it could be something else) a drop or two of Ronsonol or any other naptha solvent could free it up.