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

[BrianG]

Well, that's crappy. When I modded mine, I used the two pins that came with the FOC for the intermediate shaft, and the two old pins for the input shaft (the older ones are a little weaker I think).

You might want to talk to your LHS to see if they might have something from a different vehicle that would work.

Or, how about taking a regular screw and dremeling off the threads on the lower part? You'd want to make sure there are enough threads left, but that would be a cheap alternative. Off the top of my head, I'm not sure what size you'd need for this, but probably 2mm.