Thanks for all the replies! I was already aware of all the commercial
solutions and some of the home versions. What I was mostly looking for
was reports of experience with them, and I got some really useful info
about real world experience with them.
Bill Hunter's approach and apparatus appeals to me quite a bit. I
suppose one could do the same thing with the commercial 'reverse vise
expanders' with something on the working faces to conform to the threads
and avoid smashing them. The problem with the expanders, and possibly
some of the others, is that the front element bulges out into the plane
of the threads, so one can't get a good angle on the thread area with
the FE in place. And, of course, one can't remove the FE with the dent
in the filter ring! Catch 28?
One further question occurs. How malleable are Zuiko rings? Unless they
are extremely malleable, pressing the metal out to where I want it, but
no further, will end up with the metal springing part way back when the
tension is released.
Time to cogitate before taking any action.
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