thank you very much for that info... however this is not a 36, it is a 60. does anyone know if the cnc upgrades will fit? I know walkera makes upgrades for this model, but to be honest the look really stupid and cheap if the trex stuff will fit (I am not sure about the main shaft diameter) I would rather uprade with those parts. so if anyone knows if the main shafts are the same diameter with the holes in the same place then I can upgrade to a whole new rotor head ass. thanks