I added an xmod ball bearing at the end of the motor. I took out the little metal bushing in back, drilled a hole thats a bit smaller than a ball bearing where the metal bushing was. Then i added tape around the motor shaft at the end enough to fit perfectly the ball bearings hole. then I closed the motor and the ball bearing went into the hole that I drilled replacing the metal bushing. Have fun. Everything was placed on a gen1 xmod using a stage 2, 9 teeth motor.

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And this is my aluminum wheel. How do u like it.