Distributor centrifugal advance sticky

I had some problems starting the car hot (and It caused a bad situation). The timing seemed over advanced, even though the car did not knock under WOT (this is the worked over 440 on the Imperial, described in a thread a bit further down, compression is about 10.5). It was suggested to see if the centrifugal advance is sticky. Indeed, it seems to be. When I twist the rotor, it does not return readily. Is there an easy way to remedy this? I sprayed penetrating oil, did not seem to help.


Thanks