What's under YOUR turntable?

A 300 lb steel and lead laboratory isolation table. I got it at a local auction (actually it was in a lot of two and I sold the second one to a local Audiophile here on A'gon - Michael are you out of traction yet?!). I think it was made in the 1960's by a company called Vibrostat - I cannot find them listed in NY where they used to be, but similar laboratory isolation tables are still being produced by other companies and go for around $1200-1500, and probably cost your first-born to ship them anywhere. My TT is on inexpensive brass cones as well. Not recommended for the feint of heart, or weak of back! It takes two people to comfortably move either of the two parts of it. Seems to work very well, but I need to try it without the shock-absorber type springs on the four corners, as I think that may be an improvement. As it is, it is very sensitive to movement in the room. It is most definitely an overkill solution! I am just getting back into my vinyl so the jury is still out on this one!