Good afternoon OF, I recently purchased a 1975 Longines Admiral with a caliber 6651 inside it. Watch is working great but the only concern I have is that the rotor is loose and flickers a bit, making some noise when turning the watch upside down. Do you guys know if I could purchase the screw that holds it into the movement alone? Do I have to purchase a new whole rotor? Is there any "generic" screws that may fit the gap? Thank you so much for your help, OF! Best, Javi.