The noisy rotor at a PAM is not because of the 7750 movement. The noise is because of the P.9000 deco plates at the movement. The rotor must sit very high over the bearing and that fact makes the rotor wobbly and noisy. The Asian rotor bearing is not the best and not made for this extra stress.
Normal rotor at a 7750 movement
PAM rep rotor at a 7750 movement
Sent from my iPhone 6
Normal rotor at a 7750 movement
PAM rep rotor at a 7750 movement
Sent from my iPhone 6