Yes , Athough I belive its ok; I replaced it along with the new rotor head and main shaft. Main barrings was also replaced and belt. I had a landing that was a little to hard and the tail was not tight enough. It slid forword and on my next flight the belt jumped track ,bound and broke. After replacing the main shaft and flybar It had a nasty wine to it,So I replaced the whole rotor head. It still had the wine ,the only thing left was the motor. I replaced that and sure enough that was it. Im just trying to fill you in on all the changes since the crash. Also I changed the pitch from 11% to 10%. I had the thought once that maybe the les pitch could be the problem. Thinking maybe the heli was at a higher rpm at hover then before. So I changed that back with no help to the problem.I have also noticed that my trex on the G3.5 also has a little tail wag ,not as bad as mine but its there.