Fred,
I gave up twisting by hand a few years ago, and I built a twister.
I got thinking about this after both my father and one of my friends had shoulder surgery. Twisting is one of those things that is hard on my shoulders. With the amount of the twisting I do its a good thing. I have 55 one foot bars one inch square tomorrow. I don't have a torch, but I get good even heat on the stock and run it. Mine runs at 8rpm. I woudn't mind a bit faster, But I don't want to decrease the torque.
Del
Btw, are you going to caimbridge this year?