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Thanks fabr, I don't understand your method but I'm really interested in trying it. When you clamp one end and chuck the other, are you saying you pull and rotate the tube at the same time?Yes. Pull very firmly and it will straighten right up. It only takes a few turns. So it "twists" the tube?Yes No work hardening issues here when you go to put the flares in the ends?Not with steel tube. I have no idea with nickle copper line.
I did notice that like was specifically for 3/8. I have seen the same ones for smaller diamters. I think Eastwood and Jegs are two sources. Jegs about the same price but Eastwood more expensive. I live in an area where selection to straight tubing in the product I want is limited. I can get steel or the coated stuff, but no nickel copper or stainless.