Hi Doug
That does not sound promising
There is a small capacitor in the circuit near the motor , that may have given up
the service sheet does not give a circuit diagram or a value for the capacitor
It does not look easy to replace the motor Mechanism
The mechanism is the same for 6052 and 6152 turntables
The Part No. is- 50 6052
I had one 6052 turntable that turned quite slowly compared to my 6152c turntable but as both were bought second hand
you never know how much they have been used.
I ended up selling the slow one
Regards Zmil