I tried the two disc method and I couldn't make a nice large hollow area. They were skimpy and the walls seemed to be very thick. I use mandrels that I made myself from various sizes of stainless steel tubing. I do practice making them with the two discs and I'm geting better, but I still prefer the puffy mandrel concept.
I buy my stainless steel tubing at various places but mainly at Swage Lok. I try to get the thinnnest wall possible and cut my own length and use a cut off wheel to cut a small hole in the mandrel for blowing.
Brandy
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Brandy
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