The glass walls still needs to be at least double the thickness of the mandrel but it may be easier with boro tubing and no mandrel at all.
ETA: You can make the walls much thinner without the mandrel sucking out heat and you won't need separator.
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Polly
"Confidence, like art, never comes from having all the answers; it comes from being open to all the questions."
-Earl Gray Stevens-
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