Pioneer CT-F1250 - Rebuild the take-up motor (RMX-047 or 047A)

Hi, I have a beautiful Pioneer CT-F1250. The common problem with these 40-plus year old dinosaurs is that the take-up motors go bad with lack of use or get "dead" spot on the motor then lose torque. I know that there is limited success in rebuilding these but I thought I'd try asking here. Hit me up if you have had success or willing to give it a try. The motor is the RMX-047 or 047A. Models CT-F800/850/950/1250 all use this motor. The CT-F900 uses the RMX-038. Thanks!