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I've not run into this, but, I've been wondering about how they did it at the factory and how hard it'd be to replicate it. Heck, a service to do it wouldn't be that bad - send in your tube and get it back rebound.
I think the origional stuff was a sillicone of some sort. I'm sure there's a modern day one that'd work. It's holding it and filling it that's the tricky part, though neither seem insurmountable - use a jig and fill carefuilly. I'm imagineing something that holds the CRT horizontally, and then something to hold the glass in front of the CRT properly (suction cup device?). Seal the tube with tape around the edge and fill. I'm starting to think more and more that they wrapped the tape on the tube *before* filling it. Or, maybe they had a teflon band or something?
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