Di, perhaps it's not come to light before now because so few lampworkers are technically minded enough to check their beads with a polariscope to see if there's stress or not. Or not interested enough to go thru with all that, trusting the manufacturer to make a product that performs as stated. I am so sorry you've gone thru all this after making such a substantial investment.
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ESC
Soft glass on a Minor/concentrator since 1996
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