Also, I have watched some of the boro folks work with tubing and they had mentioned that letting the shape condense and shrink in a bit and puffing it out and then repeating the cycle a few times can help get the thickness more even overall.
Something again about the way the thin part cools and stiffens and the thick part holds the heat and can expand with the puff pressure and that doing it a few times can spread the thicker parts out and the reheating helps the thin parts thicken up.
Good Luck with this and please post pictures of what you learn. I am seriously hollow challenge myself although I study the details like mad.
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