I have no rubbing with my rw racing 49t pinion. The motor cover can warp if you screw it down too much.
http://www.thercracer.com/2013/07/ho...nky-with.html?
I'm loving the TT02 atm with my 17.5 and this FDR it's rapid.
I have a big update on the blog soon I have one more outside race to do first