2 blade tr
D model
Tip weights when removed ips is lower
Normally balance when t tail removed then replace t tail remeasure and ips gets better
The buzz through the feet gradually getting worse however if in perfectly balanced flight no buzz as soon as you pressure a pedal buzz would come back.
Last 200 check tr box making metal not enough to set of chip detector. However replaced gearbox with a zero timed from oh
At same time mr blades back to htc for disbonding at the grips. Balance on tr now dreadful, back to shop put back old gearbox that has been overhauled better result but not acceptable ( info as per original post ) last time had this output shaft on box had gone undersized. Currently replaced swashplate and pitch links.