Having done a lot of testing and measurements on the SP10mk2 it was evident that the motor is one of the weakest links after the chassis. So I set about modifying the motor to improve damping and increase rigidity. It's not uncommon for the spindle to loos in the rotor and even if it's not it's glued in and not an interference press fit.
The rotor was bored and sleeved with brass the sleeve was bored and the spindle pressed in. This is now an interference press fit and as rigid as possible with the OEM configuration.
Blu Tack was added inside the motor to damp the housing and the whole lot reassembled and tested. Vertical platter runout dropped by about half to 0.2mm from 0.4mm a good result.
The bearing is also not a great design. it's also a close slip fit and glued in, once the glue is broken the bearing can be inserted by hand pressure, WHAT was Technics thinking, this should be an interference press fit. This still has the stock bearing that I'll fix at a later date.
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