ORIGINAL: sammy64

Pulled the Heli apart and rebuilt everything in the tall to get rid of the vibration .. new tail shaft (using the trex tail parts and grips in the HM housing) got it all back in shape and aligned and powered it on with no main blades or feather shaft .. just a little vibration from the stabilizer at full throttle .. finished reassembling the tail and balanced the tail blades (Align 3K CF).. the blade grips where lose .. just need a little force to move the blades in the grips now .. tested and the vibration was still very little on the stabilizer .. put the head back together and tested .. still just a little vibration .. put on a nice NEW balanced align 325 woodies and all of a sudden the dang thing has the vibration again .. swap out for a 315 woodies pair and the vibration normal again.
doing all this i was also able to fix the tail boom and my belt issue .. belt is almost center in the boom..