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I don't think all that much would leak out if there were a shoulder o-ring crushed into head of the fitting, but I don't think the O-ring would last very many test cycles this way.

7/16x20 UNF from what I have been able to find, the problem is this is parallel thread and the seal is normally the copper gasket where the tip gets narrower. A shoulder O-ring fitting might work for testing, but it would be normally unsupported so would tend to blow out. Ike

I have been working on finding some off the shelf solution to this too, but have not found one yet. Ike

I would say rebuild, do like the army does, press in a new sleeve, and add a new standard size piston and rings. There was a guy on ebay selling sleeves for a reasonable price a while back (I think around $50 per pair, but that is from memory) Ike