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I had an idea on how to fix it, though I must admit I think more like a machinist than the electrician I really am. Sometimes that can be a good thing, though I have yet to lay hands on a 15GP22.
Seems to me the welded seal is the problem for many of the tubes, so why not get rid of it entirely? I mean, if there's a metal rim embedded into the glass, could you not just trim it back flush with the glass, then mate the 2 glass parts of the CRT together the same way neck glass is attached?
One other thing that I wonder about, is why if the metal part was leaking would you attempt to fix the leak by any other process but welding? I mean really, if 1954 welders could do the entire tube rim with a TIG torch, what's stopping those with rim leaks from sealing up a little pinhole? Is it really that difficult, or do tube people really not think that way RCA did back then?
To me, even difficult problems usually have very simple solutions...
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