Here we go:
My work has been completed with MAJOR success of reconditioning an old original motor. The transferred vibrations had been completely eliminated to the plinth through motor. As I figured, I packed the magnet well topped off before sliding it back into the spindle hole. I had to apply some pressure to the bottom of the anchor so to fit the c-lip back in. I used typical dielectric synthetic grease that really showed magic of not being able to go through the spindle hole with sufficient viscosity to make every part of spinning magnet bathing in grease under pressure. There I followed principle of drive shaft or wheel bearings. Some degree of vibrations was notable when applying extra pressure to plinth, but those cannot be heard at all neither at the beginning of record nor at the end of dead wax.
I liked this grease so I’ve used it on my cue lever also with success.
Overall, GREAT TT.