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Author Message   Sevo Tinkerer Username: Sevo Post Number: 39 Registered: 09-2008 Rating: N/A Votes: 0 Posted on Tuesday, May 05, 2009 - 02:58 am:    Sounds like freewheeling sprockets to me. These uncouple for rewinding, and if the coupling has jammed due to hardened grease, dirt or worn components only the friction drive on the spool will advance the film.