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http://en.wikipedia.org/wiki/Fretting
that explains it all, I was a Transmission engineer for while, I say splines of gears on an Input shaft completely worn off so the Gear Spun on the shaft, The two parts originally had an interference fit that required a 10 ton push on load.
Keppel
In theory, perhaps, but in practice, I'm not so sure. I've fitted a few of these, and they are TOIGHT. if they can't move in the first place, it can't get worse. Long term product test required!