Nat I have bent a double bend shaft by simply heating it with a torch at the place you want to
bend. I used a vice and two heavy duty bolts that I had secured in the vice about 2-3 inches apart, one to secure the shaft and the other to bend against. Once you've heated the spot where you want the bend to red hot, the shaft bends easily against one of the bolts. Wear mitts, of course. You might try it with a scrap piece of shaft first to
get a feel for it. Also, it will discolor the shaft at the point of the bend.