Hey all, I just replaced a spur gear on my revo 3.3 and tighten it to where i can push it barley with my finger as i have a allen wrench on the other end. I took it out for a drive and for some reason the lock nut on the end kept coming loose causing me to have no drive. I have replaced this lock nut with a new nut but still it comes loose again. Any ideas on what it could be?