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Author Message   Steve_roberts Tinkerer Username: Steve_roberts Post Number: 59 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Wednesday, December 01, 2010 - 02:28 am:    Thanks very much, Bill. That diagram does indeed look helpful. For starters, I can see what I take to be the three set screws referred to by Kelly three posts above. I'll go back and keep worrying away at it! Best wishes, Steve