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Run a tap through it to see if they will clean up.
I just put a thread gauge on the one I have and it is indeed 1/4-28 x 1" .
I got a couple of NOS off of ebay.
I am “assuming” that if you tap it out to a 1/4-20 and use a good thread lock, it is ok.
(that is probably what I would do if it were mine and did not have a spare).
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That’s how I got to this point. Without really thinking (because 1/4-20 is such a common OMC size) I ran a tap through the brass piece and it went through without much resistance. I thought it was because it’s soft brass, but now now think it’s because it was already stripped and wallered out.
This part seems to be a weak link for the OMCs of this era. I’ve run into stripped ones before, though not a majority. I can see the necessity for a flexible metal, but I wonder why they went with a tight thread pitch instead of the typical 1/4-20. Must have been a good reason for it. Engineers…..