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Author Message   Rick_oleson Tinkerer Username: Rick_oleson Post Number: 559 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Tuesday, April 15, 2008 - 08:40 pm:    Is there a pair of spanner holes in the focus knob? If so, unscrew the face of the knob, it should be hollow with a threaded shaft and nut inside.