The SR 510 was made known to me via another forum.
The Forum Member 'Shakti' is possibly one of a handful of individuals who has encountered an unusual wealth of Analogue Sources, that are supported by a Downstream System costing much more than a $100K.
Their having experienced an extensive range of Vintage and Modern TT's where TT's are exceeding $50K and Tonearms where these have approached $50K, along with Cartridges experienced,
that must be up in the hundreds and ranging from $1K - $20K.
When an individual explains as a stock item inclusive of Tonearm the set up was very comfortably seated along side vintage models costing 30-40+ x more as a purchase. It would be foolish not to create similar, especially as it is very affordable.
The same individual stated that with an improved Tonearm, they expected the TT set up to be a substantial performer.
A man with no dog in the fight sharing their impression of a TT in relation to their vast experience, can't put a negative comment, apart from suggesting a change of Tonearm will be creating something quite special.
This TT as stated, is rigid as a structure, which has substantial benefits for the mechanical operation of the TT.
Not all JVDD TT's have such a rigid structure and this is a much unwanted condition for a mechanical operation.
A non-rigid structure when speed checked using a Standalone Strobe, will show Speed fluctuations immediately.
Combine non-rigid structure with a Spindle that is not a perfect fitting to bushes, especially if movement is detectable (very likely), and speed fluctuation detected will be very concerning.