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Author Message   Douwe Tinkerer Username: Douwe Post Number: 4 Registered: 01-2010 Rating: N/A Votes: 0 Posted on Tuesday, January 19, 2010 - 09:32 am:    Problem solved. Cleaning the surfaces revealed some rough spots that were probably caused by grit trapped in the mechanism. careful sanding, cleaning, and lubricating did the job. Thanks to all of you for the helpful advice. Back to picture taking for me!