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Old 05-05-2005, 10:06 PM
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a lock uses a manuel locking device such as locking gears or air activated gears that mesh together to turn both axles
posi's use abestos or carbon fiber clutches that put pressure on the spider gears when going forward but the pressure is relieved when turning.
Spools are a replacement for spider gears and both axles turn no matter what not for street use!
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