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The right-angle drive came from American Science and Surplus. I don't

know how many watts it could reliably take, but I figured by the time

my work got through the triple rusty tallbike chain, the secondary

chain, and the gummy old bottom bracket that had been sitting in my

yard for years, it wouldn't be a problem.

  

I initially tried a bevel gear from an angle grinder, which is ideal

in a lot of ways, and gave me the opportunity to saw open an angle grinder.

Unfortunately, it was sensitive to gear placement, and my caveman

technology had too much slop. Kludges like an 8mm bearing

on a 5/16 inch shaft wouldn't cut it, never mind that universal joint.

  

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Taken on August 13, 2011