I picked up a new (used) lens with a Copal 0 shutter. The lens runs fine at all speeds, but when you turn the silver cam ring to change shutter speeds, the black ring with the marked speeds follows it along. I don't see what is supposed to prevent the shutter speed ring from turning. It has a small detent on the back, but this doesn't appear to line up with anything. Just tightening the chrome lock ring in the middle doesn't hold it in place.
I've looked at some on line reassembly videos, which are quite good, but this step is skipped over.
Thanks for any help.
Kevin
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