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Old 02-11-21, 12:20 PM
Andrew R Stewart 
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Why does the tube end have to be a square cross section? Why won't a fillet brazing of the round ended tube to the square form not be doable? Is there a aesthetic reason? Structural one? Does some not mentioned part have to interface with the tube in a way that the tube needs to be square as it contacts the form?

My first thought was to make a tapered square mandrel that, along with a vise, can be inserted and serve as the shaping tool. I'm unsure if I agree with guy153's tube cracking concerns but that is what fabricating something new is about, discovering what works and what doesn't. One could always anneal the tube if it was found on the practice (you will practice this first, won't you?) that the tube did crack. I do like his alternate method though. Andy
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