Locking the revo in 2nd gear to use motor braking/reverse

[BrianG]

Yeah, you're gonna have to drill the shaft hole out a little and it'll be kinda tough since the shafts are steel. Use a vice, NOT your hand to hold the shaft while drilling. A drill size just big enough for the smooth part of the pin, but no slop, is needed. Then, the hole in the gear (where the pin's threads will bite into) need to be widened just a bit too.