Chasing down the massive tail vibrations on this Heli. The main belt drive gear has excess clearance on the one way. Eating bushing even when the pinch bolt is tight the gear can wobble pivoting on the bolt ! The wobble creates aan oscillation down the belt drive adding to the vibration problem. Looks like they machined the gear with excess clearances. We also found the gear to be miles out of round as well see the next video. This is just plain shoddy rubbish guys.