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Make your battery or mains or even wind up motor more than 6 times faster than it's normal speed!
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Knex Engineby Castroscity
The K'nex 3 Speed Gearboxby knepic
K'nex Gearboxby gingernutsjonny
Smallest K'NEX Differentialby GWorks
Knex Gearbox/ Transmissionby zmxninja
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