The OD rebuild is really quite easy. Just work clean , and as you disassemble it , lay all the parts out the way they come out to aliviate confusion The directions look complicated, not because it is , but because they are very complete, and don't leave you guessing.
Duane definately has the best price on parts (and the right parts too)
You might want to rebuild( internally re-seal ) the solenoid while you're down there ( Duane has the parts for that too, ( I think he's the only one you can get those parts from ) very cheap compared to a new solenoid and very easy to do .