SNIP
>My repair is not perfect, as the filter threads were slightly damaged by
someone else attempting the repair before I started. I can get a filter on,
but with great difficulty only.
One can file or grind the damaged threads away; the rest of the
threads will be more than sufficient. To file the inside of a ring,
use a diemakers rasp file. Actually a stout sharp steel knife will
work; one can whittle aluminium with a steel knife. A 60-degree
edge is best; sharper (more acute angle) tends to get caught and to
gouge.
One technique for restoring threads is to make a thread
cutter/cleaner - you could take an old filter, cut across the threads
with a fine metal saw or file and screw it in slowly like a tap,
backing off frequently. It will tend to reshape the threads and cut
away any burrs. I've not tried it on a lens as the occasion hasn't
arisen but it works well on smaller screws/threads. It would help if
the filter ring metal was harder than the filter ring - i.e. don't
wreck an nice B+W brass ring!
AndrewF
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