There are many smaller workshops with glass blowers, I will ask one of these artists if it would be (a payable) challenge, to repair the defective tube. Otherwise, as I said, I will use plastic padding and try it myself.
I would think that the whole tube would have to be heated to some extent to keep it from cracking elsewhere…
Have no idea what that would do to the gas mixture, mirrors or other parts.
Good question for someone that has the knowledge… Please post their response.
It can actually be done very locally in a very small area without the heat spreading.
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