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Author Message   Rick_oleson Tinkerer Username: Rick_oleson Post Number: 1256 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Saturday, December 08, 2012 - 08:31 am:    If I am remembering it correctly, the screw holds an eccentric cam .... you would loosen the screw, rotate the cam to adjust the position of the rangefinder follower shoe, and then tighten again. It's been a long time, though, you may have to take a look for yourself and figure out how the parts interact.