OK. I have a small problem. A #0 Copal shutter mounting ring has jammed tight on the lens. Its backed part way out, leaving the lens on the lens board largely unusable. I suspect that a sliver of metal between the mount ring and the shutter threads is the source of the problem. And I'm concerned about stripping the threads on the shutter.
I have thought of at least two ways to remove the mount ring:
1) freeze the shutter to shrink the metal, heat the mount ring to expand just that one piece, and try to unthread the ring from the shutter.
2) using a jewelers file, cut the mount ring from the shutter.
What's the best way to remove the mount ring in a way that does the least damage to the shutter and mount threads? I can always replace the mount ring if needs be. Thanks for your thoughts.
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