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Re: [OM] dented filter rings/wtb

Subject: Re: [OM] dented filter rings/wtb
From: andrew fildes <afildes@xxxxxxxxxxxxxx>
Date: Wed, 7 Jan 2004 14:49:46 +1100
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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