Interestingly, I just fixed a similar problem this past weekend. My pulpit rail was bent in about 4"in a curve along a 4' length of 7/8" ss rail (don't ask.) I talked to my metal guy who advised against my idea of using heat and C-clamps pulling against a straight edge board. He said that instead we needed to "push" the rail out using pressure. He fabricated a simple tool (sorry no pics.) Imagine a 5' long piece of 2' box steel, with "strap hooks" at each end to hang the device of the rail. On the box steel, he mounted a small hydraulic jack that would slide along the box. We then hung the device and started pumping the jack head out at various places along the bent area, obviously starting at the apex of the bend then working out toward the ends of the bend. Within 20 minutes, we managed to "push the bend out," moving the jack along about 10 times. I had unscrewed the base of the nearest stantion, working it by hand back into alignment. Now the rail is very, very close to perfect. Total cost: $150