I am having the same problem, I am goin to hobbytown tomorrow to get a steel pinion. Kinda crappy that I can't run more than 5 min without the pinion slipping off. I guess that is how they make their money! Does anyone know if anyone makes the aluminum spurs for the micro Rs4? I use mine on pavement and all of the plastic looks like it is goin to take a beating. I only use it on smooth pavement, but every gravel can't be avoided.
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