Quote Originally Posted by Tom1956 View Post
For the front rings, I go to a hardware store and find a piece of pvc pipe fitting in the plumbing section, or improvise a similar correct-diameter hollow tube. Then I tear thin strips of duct tape to make a cushion on the edge of the pipe fitting. This cushion gives friction so I can push down on that lens ring to try to get a "grab" so I can start turning. Sometimes it works, sometimes it doesn't.
I'm surprised that it worked with that tape.

But your hint gave me the idea to apply a fit O-ring to the lens instead and then use that pipe as described.