I had a VPI Hw-19 that I modded and tweaked a lot over the years, including the platform and supports. A few years ago I bought a Hanss T-30. I can divide the tweaks I did with the VPI into what still works, and what is no longer needed. What works: a support in the basement, under the player. No more skipping when I jump on the wood floor. A very solid granite rack. What is no longer needed: a sand box plus some air damping under the player.
The right footing for a turntable
Replaced the brass feet on my 401 plinth. They sat on 3 sample blocks of granite on a heavy oak table. I don't like ro spend if I don't have to. So, I had these stainless steel cone footers lying around and stood them on the granite blocks, points up and sat the 50pound plinth on those. Ridiculous improvement. The soundstage is now locked in an unmoveable focus and the center image has moved up a foot. It is the weirdest thing! A slight light-brown coloration has vanished. Bass is now absurd from the Quad ESL57s. The quality of the source has lifted the performance of all other components.