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Re: VEX ?
Also what you can try is opening up the VEX motor and make sure there is nothing in the gearing inside the motor i.e. hair or the like. We had a similar problem and it turned out to be one of the girls hair got caught in the motor and prevented it from moving on the ground but not while being held in the air. Also remember that the VEX motors are mini gear boxes check those workings often you might have snapped something.
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