wow, that is crazy about the inside of your gearbox. Agreed, has to be a bad bearing which made that shaft turn/wind up and tear up the plastic w/ it.
How often do you guys open the gearbox to lube your metal bearings?
I hate doing it because I feel that everytime I take apart my chassis the screws aren't going to sit as tightly as the previous ...you know how if you keep removing screws from plastic and screwing back in eventually the seal is becomes loose. But with that said, I take my chassis apart to check and re-lube everything about once every other month (but I also get about 6 races in between and another 4 practice sessions in). I do replace my chassis every year though, ...at least I did w/ the M05 VI ...my V2 only has one race season on it so far. I'll probably change the chassis out sometime this coming season ...just because the plastic gets a bit weak. ...especially around the area where the steering screws go in. But chassis are cheap.