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Think about the size of the sand pipe and how small the "sand" would have to be to get down that diameter of a pipe. I think instead of "sand" you'd be using something akin to "Talcom Powder" and although that might dry the track of oil I doubt if that would inprove traction. If what you used was gritty enough to actually add traction, it would also be so small as to get into bearings and such and wear them considerably faster you'd want.
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