Stock 18T pinion gear on Fury Mega - Set screw size?

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Arrma RC's
  1. Fury
Can anyone tell me what is the size of the set screw that holds the stock 18T pinion gear to the motor shaft? Part # 310124. The motor shaft has no flat edge on it, so I was trying to get it as tight as possible but it stripped. Please and thank you.
 
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