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rotorwrench · 12-30-2019, 02:15 PM

Speedy sleeves are primarily for worn seal surfaces.

Most of the shafts I've had repaired for the helicopter transmissions were surface ground on the worn journal then plated back up with hard chrome or Chromalloy. The shaft then went through a relief process to prevent hydrogen embrittlement. It was then surface ground back to its original dimension. This was all a very expensive process but the cost of a new shaft was a lot more. The cost of an input drive shaft for a Model A is likely less than those type of repairs at around $225 US. I guess it depends on how long a person wants to keep running the parts. No matter what, it will cost time or money. I think I'd look for an undrilled phosphor bronze bushing blank and cut it to fit the worn stub. The bronze bushings last better than a lot of folks give them credit for and they won't gall.

12-30-2019, 02:15 PM	#24
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,436	Re: Pilot Bearing Question Speedy sleeves are primarily for worn seal surfaces. Most of the shafts I've had repaired for the helicopter transmissions were surface ground on the worn journal then plated back up with hard chrome or Chromalloy. The shaft then went through a relief process to prevent hydrogen embrittlement. It was then surface ground back to its original dimension. This was all a very expensive process but the cost of a new shaft was a lot more. The cost of an input drive shaft for a Model A is likely less than those type of repairs at around $225 US. I guess it depends on how long a person wants to keep running the parts. No matter what, it will cost time or money. I think I'd look for an undrilled phosphor bronze bushing blank and cut it to fit the worn stub. The bronze bushings last better than a lot of folks give them credit for and they won't gall.