Interesting that you didn’t notice much difference between the standard glass and acrylic platters, I think if I do change the platter it will be to the heavier Delrin/Acetal one from Fidelity Designs, it’s slightly heavier than the standard platter and more peripheral weighted. Partly because I have a taller cartridge and because I’ve always found the SQ to be better I use the Origin Live mat on my P3 and a 1.5mm shim under the armbase which gets the VTA perfect. Not familiar with the silent base you mention, I have my P3 on the latest lightweight Rega wall mount which I’ve found gives excellent results even though one of my speakers is less than half a metre away from it.
The twin belt pulley should improve the W&F but turns the deck to 33.33RPM only requiring the purchase of a TTPSU to get 45RPM
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