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1990-12-10
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Many older style bikes have
crank cotters. These are special
bolts, one goes thorough each
crank, holding it to the crank
axle. In time they become worn,
which causes a clunky looseness as
you turn the pedals. To replace a
cotter, remove the nut, and hit
the threaded end with a hammer.
Normally, the cotter will slip out
of its hole. If it doesn't, try to
avoid killing it with your hammer.
You may need to heat up the crank,
or drill the cotter out. Put
grease on the new cotter, tighten
the nut on, tap it lightly with a
hammer and retighten it. Cotters
are soft steel, so don't
over-tighten the nut.
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