I'd reccomend buying a new one. If it's an Aquamet shaft, the material has "memory" to flex, twist, bend, etc. and then return to it's normal state. Any bends beyond that in my mind tell me it's spent. In addition, think of a driveshaft on your car..... it's balanced!!! Same deal with your propshaft, being straight is akin to being balanced. If it's bent it will probably have noticeable harmonics and wear out strut bushings prematurely at a minimum. Tom at Menkens at the top of the page can sell you a new one of proper length. Personally, that is just not an area of the boat that I want to be frugal with.