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Ed (AK user Colortel) told me about 25 years ago in this quest that a "frit" (unsure spelling???) was a piece of special glass that could be laid around the circumference of the tube at the seal that would transmutate into the glass and metal with heat during rebuilding.
Ed, if you read this, maybe you could refresh my memory, enlighten us and elaborate on that? I had kind of forgotten the conversation...
Charles
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