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Author Message   Rick_oleson Tinkerer Username: Rick_oleson Post Number: 487 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Sunday, January 13, 2008 - 11:37 am:    I'm not sure then why it behaves differently with and without film... the only other place where the film touches anything is the sprocket shaft, so maybe that's it. The wind spool is supposed to have a slip clutch so that it lets the sprocket, rather than the takeup spool, determine how much the film will be advanced. If that clutch is jammed, then the spool will try to keep pulling film after the sprocket locks, and they will fight each other.