@dekay I have no dog in the race, I don't use Belts to rotate a Platter.
Additionally I gave up on TT's of any design that showed improvement with an Off-Board Speed Controller many many years ago.
On a TT that has extreme speed accuracy built in. I do like a Vacuum hold on a Vinyl LP from a Vacuum design that can comfortably maintain a Vacuum for 20 minutes + for the use of a 33 RPM Vinyl.
I am not an advocate of every LP being Vacuum Clamped - With Spindle Weight - Without Spidle Weight when being replayed.
I have a Selection of Platter Mats to be used in conjunction with Spindle Weights , and am happy to use alternative assemblies on top of the Platter.
I have had to turn down Companies requested to supply a service because of the costs submitted for a short attendance. When probing why the costs were so increased over some other costs submitted. The description given has been almost identical, to how I worded it.
Hence, maybe this methodology spills into other industries and I suggested it could be part of the Basis Business Model ??? Maybe Not!!!
All already seen as for the reasoning for the cost being referred to, is seemingly nothing more than Conjecture.