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Author Message   Rlc Tinkerer Username: Rlc Post Number: 32 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Monday, November 12, 2007 - 07:37 pm:    Thanks Rick & Steve. Yes Steve my lens is pre-set diaphragm type. It looks the same as yours on your page.I'm awed by the pics and text on your page! I find that looking into rear of lens (At minimum close focus setting) I can see the helical (very fine threads). Also there are two rectangular bars approx. 3mm wide 180 degrees apart. (Guide bars?) I can access the helical threads without disassembly. Wondering if a solvent (naptha or acetone) saturated, lint free, swab carefully applied to the threads would remove some of the grease & help reduce the friction? Richard.