I don't know about anybody else but I've wasted a few spur gears the last 8-10 months and finially decided to remedy the situation. Landing very large jumps or botched landings the motor mount plate will flex and chip a tooth or two of the spur gear and heres a simple easy fix. I will be testing this mod Weds.
All thats needed is a P2 pushrod and some hardware and a 1/8" bit and drill.
I retired from RC, now life is all about guns and long range shooting.