Posted by Tom C (Tbc) on Monday, October 20, 2003 - 8:12 pm:
Posted by Jaap Jan Helder (Naaldvoerder)
just now I discovered that the rubber profiled band around the focusing barrel of the lens is somewhat lose. Someone suggested soaking it in hot water in the thought that it might shrink. Hot water will probably do nothing to the rubber. Any oil products will cause the rubber to stretch, this is why the problem exists in the first place.
Oil from your hands. [Maybe, but it was in storage for some time after a house fire. DAW]
I had a similar problem. I removed the rubber sleeve and with a SHARP knife of razor, cut off sections so that it would be a snug fit. Then I put a large piece of double-faced tape on the lens where the seam should be. Attach the rubber sleeve so it is tight. My repair has lasted quite awhile. Best wishes. Of course, if it doesn't work, you can try to get the replacement rubber piece from Contax (?).
Sounds like a good idea, I'll try it when I get a chance. Got to decide how the diamond surface will match, or maybe I don't really care.
Your double-face tape gives me another idea. If I could find a way to completely wrap double-face tape around the bare barrel, and then using some magic method, slip the rubber sleeve over it, and then wrap it with something to keep it against the tape for a couple of days, it might work.
Thanks for the tip.
Concerning hot water, someone suggested that used to work on phono and tape drive bands in the olden days but of course these are not the olden days. I know it didn't do anything to my sleeve.
Replacement from Contax/Yashica, surely you joke!
I will tell you something that's somewhat related. When I worked in industry we had a project for Kodak which involved, among other things, driving a blower (then designed for filling station gasoline vapor purge systems) with a motor. Both the blower and the motor had simple V-groove pulleys. I took a length of 5/16' diameter round solid neoprene and did a diagonal razor cut on the ends to make the total length right, and then fastened the diagonal cuts with what was then called Eastman 910 cement, now called super glue. It had considerable tension when running but lasted for years in the prototype. I think one of the clues to that success is that the cuts were clean, made with a clean blade, and not touched by human hands. If I had the guts I'd try that with the sleeve but getting it lined up would be a problem. I guess I could use a smaller cylinder covered with wax paper as a tool, what do you think?