[rotorwrench]

I didn't bother to mention the hard chrome or Chromalloy processes due to the cost. They turn worn area down to remove the surface irregularities. They plate it or plasma spray it back above specs then precision grind it back down to spec. I've had more than a few shafts for helicopters done but they are 6 to 10K $ shafts so they are worth the trouble & expense.