Larry,
Dito on not welding the mast. Everyone I talked to says you have to have the whole mast retempered - because you cannot temper only part of it. I just repaired my mast - put a sleeve inside it. I had a crack about 3/4 of the way around it down where the vang bracket and the turning blocks for the halyards were fastened. Here in Kansas City there aren't any places to get mast retempereed.