Pinion gear sliding away from spur

kyoto

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Arrma RC's
  1. Kraton 6s
  2. Mojave
C2BDFE5C-F77F-4CEC-84B5-086A18F649BB.jpeg

Currently having problems with the pinion gear sliding down the motor shaft. The grub screw is using red thread locker and is tighten fully and isnt even getting undone. Yet the pinion is still slowly sliding. Any ways to prevent it? Is it because there’s no flat side on my pinion? (I am using a Limitless 39T spool as a pinion)
 
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