That's a nice looking little tool bender John, I could do with making one of those!,when I bent the tubes for the Liney engine,which were brass, I just turned a groove with the parting tool in a piece of 15mm ali ,3/32" wide (the same diameter as the tube)and the same deep(it doesn't need to be round at the bottom,it's the sides that need to be held in place) and pushed the tube round it on the lathe cold, holding one end with the parting tool ,it can't kink because the edges of the tube have nowhere to go, the 1/8" stuff I did the same thing but heated it up a little as it is thicker, it worked fine, I think that if there are only a couple of pieces to bend, this may be the simplest solution...Giles