Sorry Bug, dumb comment on my part (post now deleted). As well as friction off full and free check, i assume that track and balance would have picked up on any unexpected friction in the MR feathering bearings. Under load friction could be higher though.
TiPwEiGhT are you sure pitch bearings OK?
Not familiar enough with design details to answer question. Pics of main rotor:
http://www.b-domke.de/AviationImages....html#Robinson Couldn't find tail rotor images either.