Well progress at last
I split the chassis to trace the wiring
I found there are two wires going from the motor to a 4.3uf large capacitor and a smaller one being switched in for 50 hz. This explains why one of the selector 50/60hz switches is open for 60 hz.
The wires run from the motor directly to the 4.3uf cap in the middle of the chassis sandwich. Impossible to see or modify if you don’t split the chassis
In addition these two motor cap wires run to the motor internally and to the tag strip on the back of the motor. The cap is connected to A and C as well as the motor coil
This also explains why the TK60 and tk30 only have two power in tags on the motor. It’s because there is a direct connection from motor to cap in the middle of the sandwich
Finally I removed the 4.3uf cap and measured it, looks open. I measured the new 5uf cap and it reads 4.3. See photos and my YouTube video
https://youtu.be/vQTPYFB_KBU
Will reassemble tomorrow and test. What concerns me is that I did actually connect the new cap to A and C previously with no joy.
The motor config seem like a 3 phase delta config. With everything disconnected I got about 99 ohms no matter what I measured.
I bought a TK60 to investigate and possible steal the motor but it’s a 165v unit whereas the TK64 is a 135v unit. But I only measure around 110.