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I heard of someone using a small piece of shrink tubing with some holes punched in it, but don't know how reliable that is.

Art
That was probably me. I've been using a BJones lens insert installed on a USGI aperture with heat shrink for the past year and find it works quite well. I've worked out most of the gotchas and would be happy to post instructions if anyone is interested.
 

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Nice job. I think I see what you did, but let me make sure:

The cylinder of the shrink tubing is oriented vertically, and you punched a horizontal hole for the aperture opening. Is that correct?
That is correct.

The other option would be to orient the shrink tubing horizontal (so the two ends become the hole you are looking through), and you have to punch a hole on the bottom for the parture to fit in, but I think this option would be more difficult to do.
Interesting idea. I'll experiment a bit and report back.
 
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