After 3 months of use, my 7750 rotor just doesn't seem to be spinning as freely as it used to. I first noticed that the movement was losing power after just a few hours, and then I realized that I wasn't really getting the typical "rotor whirrr".
So I probably need to get my movement oiled professionally in the near future. However, would oiling the rotor bearing be simple enough for me to perform? Is the rotor bearing the source of my problems or is it other parts of the movement?