@lewm The Engineer I use, is an individual renowned for their knowledge and their unique modification works carried out on the SP10 MkII, my own SP10 MkII is modified by this person.
I can assure you that others, that are renowned in their own Countries (yes even the US) for their works done on Japanese Vintage TT's, have picked my engineer friends brain at some point.
I have had many a discussion about the ideas behind the engineers practices and how the practices of others are said to impact on the SP10 MkII.
I don't believe there is much that can be done to my own TT, that will improve on it electronically, or for speed control.
The next frontier is the attempts to improve the mechanical interface for the seating of the drive gear and the Platter Spindle Bearing being a complete overhaul and not the already put in place upgrade for the assembly on the one I have in use.
As stated previously, I am keen to learn, if the rethink for the Platter Spindle Bearing, can be one that is able to be transferred onto other Brands models, if the Stator Bowls are remade using a CNC to accommodate the new bearing housing design.
The CNC owner has access to substantial thicknesses of Thermoplastics, and has the programming skills which can produce items to low microns as a tolerance.
Alternatively for the individual like myself, the Bowl replacement can be a simple affair to, where there is a Top Flange plate fastened to a thick walled cylinder of the ideal ID/OD, that has a base fastened to the side wall as well.