For whatever reason the input shaft for the hydro on my Bolens 1886 is severely pitted and rusty, and as a result of this the driveshaft coming from the engine doesn't fit snug on it. This causes the whole tractor to vibrate like mad, and it is unusable. What are my options here? Could I have the input shaft turned down and use a shaft adapter/ bushing? I would imagine the input shaft is a good 7/8" diameter so I could have it turned down to 3/4 and use a shaft adapter like this http://tinyurl.com/nwch5lc I know I would have to disassemble the hydro pump, which frightens me, but I really want to get this tractor going so it cant hurt to try. Any other ideas? Would my idea work?