Check out Promethean Springs from Machina Dynamica. They are GREAT!
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google "fim isolation"
GalenCarol audio is really helpful and has a chart describing the effects of different isolation products
any will work, just looking for the lowest priced ones. I need to make several stands and it is getting expensive. I think the FIM was what I was looking at but to much $$$ the symposium also look nice I am trying to get a price on them. The stands will be spiked anyhow and weigh about 40 lbs so this isjust to make it a bit cooler and may add another layer of isolation but not 100% necessary.
A friend of mine developed the small cups imbedded in the wood platforms. He gave the rights to FIM as their costs from Asia were so much lower. I have several of his platforms. I found the first Aurios were the best of the Aurios and were superior to these platforms. They are more trouble as your shelf has to be level. The newer less troublesome Aurios are much poorer as the indentation of the bass race is greater meaning that they move laterally only with greater force.
I never found Roller Blocks to be any good. I have a set with grade 3 balls that I never use.