door mechanism (rotor)

1966 Dart convertible. Having trouble with the doors. Seems the star wheel on the rotors are worn out or have a flat spot. Doors close good every second or third try. If you manually turn the rotor before closing, it works good more or less. I have adjusted the crap out of the doors and the strikers? So, the question is, "is there any way to rebuild the rotor/door mechanism? I haven't really looked, but can't believe that anyone would repop them. I'm afraid to buy a used set, install them and have them be worse than the set that's on there now.
Any help is greatly appreciated.
Jim