The pinion for the XO-1 is MOD 1, from what I understand so that wont be possible. I need to find a 32p gear and a smaller spur, although I dont have much room left for the motor to move.
You can use Nitro Revo spur gears, they are Mod1 and smaller and will bolt right on
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It's "Dr. _paralyzed_" actually. Not like with a PhD, but Doctor like in Dr. Pepper.