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Author Message   Bob_dodds Tinkerer Username: Bob_dodds Post Number: 8 Registered: 09-2007 Rating: N/A Votes: 0 Posted on Monday, October 08, 2007 - 12:33 am:    I think I need to put the guides back, and find which 180 degree cycle they go on. Only two possibilities I think. I can put the brass guide tee's back in then. To do that I think it easiest to hold the lens upside down, place the guide in place with curved tweezers, poke something up through a hole to register a guide's hole over the lens base hole, hook the guide in that position from above, stick a screw up in there and tighten it. Then I go looking for stops. There could be limit screws behind the front facing with writing on it. There might be a c-ring threaded in the outer tube behind the helical, visible, could turn with a wrench. I have some easier Sigma conversions to do first.