I was in a hurry to crimp stays similarly on my aluminum CX200 recently. My "forming tool" was a 1/4" drive, 5/16" socket (i.e. a steel tube about 3/8" diameter by 1.25" long). On the opposite side, I supported the tube with a soft jaw for my vise. To apply force, I used a single 6" C-clamp. To keep the small parts in place, I just duct taped them to the frame. It was quick and the finished product looks and works great.