Philips CD-670 CD player: a CDM2 pickup surgery

This old CD player came to me from a flee market for 15 EU. Not so much for a CDM2/10 transport and a TDA1541 (non-A) DAC.
It is in good shape but it randomly failed to read CDs.

After a lot of testing on the transport controller and power suppliers electronics, laser power adjustment, etc. ..my attention was driven toward the CDM2 transport itself. You know, it is a beautiful galvanometric transport (the arm swings like needles in galvanometers..) ..but it is prone to failures.

I cleaned the lens and double checked the foiled PCB. Nothing.

Playing with the transport (remove-check-reinstall-test cycles) I got random results. I was not able to reproduce a predictable sequence of behaviours... BUT....