I bent the drive shaft to my PHD while transporting it. Crossed a deep ditch with the tractor; the auger was forced to swing back when it hit the ground; the drive shaft telescoped out and eventually hung up on the guard on the tranny case -- bent it in a nice curve, both the male and female shafts.
The tractor dealer couldn't help, except to quote out a $300+ replacement (nearly 1/2 the cost of the whole PHD).
Finally took to an automotive collision and alignment repair shop. They got it straight enough that it slides together and only jams a little -- in my mind that's practically a miracle to get telescoping pieces that close to original. Cost was an hour: $70. Glad to pay it.
jim