Thank you all for your comments and suggestions.
Rubber band and PTFE tape as well as electricians tape should be useful;
provided that the binding occurs when I'm at home and not somewhere
miles from civilisation.
And to Andrew who reminded me of the structure of graphite - I had
forgotten about how those slippery plates worked.
I also thought of providing traction on the front ring (pulling away from
camera) while trying gently to rotate the rear ring.
I think I will apply graphite powder in minute amounts using a very fine
artist's brush. It won't migrate if applied that way.
Which reminds me; maybe graphite grease is another viable alternative.
I once sent my OM4Ti to the Olympus service centre and it came back with
a thin layer of black grease on the lens mounting ring. I presume this was
graphite grease. The problem with sliding metal to metal surfaces as when
mounting lenses, is that with some metals binding occurs (as when a car
motor seizes). Lens mounting was ever so smooth after that, and the
'grease' never caused me any problem
Brian Swale.
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