In my opinion if the one way is buggered, its buggered. I was of the impression you cant really disassemble it. You are actually meant to maintain the one-way ie oil/regrease it occasionally.
Ive never had problems with the one way aside from them wearing where one side appears to have more friction than the other. I wouldnt bother putting stuff on the drive cups. Its not gunna stick and its just gunna rip off under the loadings and go through the bearings of the one-way. If the one-way isnt already broken it probably will be after that happens. But then again you probably dont have much to loose.
With regards to soaking bevel gears, that also comes from the HPI website. It was posted as an official comment and the reasoning is something along the lines of the gears dry out and become more brittle. When i say to soak in hot water i boil some water put it in a cup then drop the bevel gear in there till the water cools down (ie about 10 minutes).
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