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To see if the gearbox is the problem, just remove the motor from the grip and replug your wire on your motor that is outside of the grip. Pull the trigger with your battery fully charged and your motor is supposed to spin, if not, the problem is the motor/wires/battery/fuse but if the motor is running you should first try to slack the screw that is on the grip plate. If there is none of this works, it should be the gearbox.
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