Bubbles are tough to do, I build them up in layers on a puffer mandrel, winding until the discs are big enough to meet in the middle.    When the discs are merged over the hole in the puffer mandrel, it gets reheated to a soft glow, then air gets “puffed” into it, gently and gradually until it’s close to the size I want.    With frequent reheating, the bubble is shaped

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