Randolph;

If I understand the description correctly, I believe you are talking about the (replacable) soft interface bushing which is intended to give way if the wipers are energized while locked (maybe with winter ice), to prevent something more vital in the works from getting hurt. I seem to recall having gotten some in an arm kit from either Trico or Anco..these are long gone or at least MIA, but you might try contacting these two wiper manufacturers. The question is how are these installed...it looks as though they are (circularly) pressed onto the shaft...but how would one go about pressing on a replacement? I'm at a loss here...anyone else have info, I'd love to see it too!

I have had the bushing come off the shaft, staying in the wiper arm during removal!...I suggest you double check there (after that, it was so loose as to allow the arm to pop off on its own, and a permanent fix was needed! Read on:

After one of the bushings got worn and my (drivers side) wiper popped of the shaft a couple of times, I extracted the bushing from the arm, and not coming up with a way to effectively swage it back onto the shaft, I carefully drilled and tapped the wiper drive shaft for a SS6-32 "wiper-arm-retaining-screw"...hasn't popped off since, but this proccess requires extreme care (you wouldn't want to break a drillbit OR tap in the shaft)!

Hope that helps