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Author Message   Chiccolini Tinkerer Username: Chiccolini Post Number: 104 Registered: 06-2009 Rating: N/A Votes: 0 Posted on Monday, July 12, 2010 - 12:09 pm:    One of two things. 1) it has been sitting for years in a half wound up condition and the spring is now "set" so it slows down when it reaches some point(s) when running/unwinding. Nothing to do about that unless you want to install a new spring. 2) it needs a re-greasing. The inner works may run smoothly when the spring is all wound up but the old grease may provide too much resistance when the spring has used up most of its winding up energy. If the camera sort of vibrates or shakes at some points while running then the spring needs cleaning/regreasing also. The old grease sort of "dries" and becomes "sticky". Then the coils of spring stick to itself so, while in use and unwinding, the coils of spring suddenly "slips" past itself when, as it unwinds, it overcomes the sticky resistance of old grease causing the sudden "jump" or shake.