It very much depends on the type of damage and where? If the tube has been colapsed then there's little hope. However if it's just bent then a steel fabricating company maybe your best bet as they will have the necessary rolling/straightening gear. I recently repaired a pulpit that had been bent straight upwards by cutting out the bends and adding a turned pieces of stainless. Worked out OK.
I did a reasonable job in repairing mine by bending them back, but it took a while before I figured out how to do it. I took it off the boat so I could epoxy the damage to the hull and redrill the holes. The feet were deformed so they were flattened with a hammer. I first traced out the foot positions on my garage floor so I could always put them back in the position they were on the boat. The legs were possible to bend into place by hand but where there was more than one tube on a T or X piece it needed a lot more force. I used rubber strips wrapped around the tubes and three of the longest (3-4m) pieces of my galvinized steel boat cradle. By putting a bold though the ends I made a kind of scissors and with a bit of trial and error found a position where I could have a bent T or X piece from the pulpit close (1/3 of the length) to the bolted end. I had a lot of leverage at the other and managed to re-bend the T peices how I wanted them. I got it wrong at the start and didn't have strong enough padding and pinched a tube, but as I hang the outboard there, it is covered anyhow. Getting the frame into and out of the contraption needed a couple of extra hands and I had to use the wife as ballast at one point... After I was happy with the T and X pieces I bent the feet by hand til they matched the mountings drawn on the floor and re-mounted it on the boat.
Difficult to repair in situ, partcularly if it requires welding. Dinged the pulpit on my Marieholm 32 a few years ago (about 1995) and was astonished at the quote for a new one. Made a jig in heavy plywood backed up with 4x2's of the deck plan around the pulpit, marking the holding down bolt holes. Removed pulpit and bolted it to the jig andtook it to a small firm who weld s/s chairs. They cut out damaged bits and welded in new 316 tube and polished off. Cost about £100. I am more careful approaching piles these days!
