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Author Message   Scott Tinkerer Username: Scott Post Number: 64 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Saturday, November 21, 2009 - 01:32 pm:    Just grasp that whole brass lens casing and unscrew it. Rubber gloves might help you grip it well. It is threaded into the shutter. When you pull that out, you will be able to see the ring that hold that other element in the casing.