Damping between shelves and sandbox


My turntable is sitting on a sandbox. On the top of the sand I have an inch and two inches thick maple board. Between these two wooden boards I am using cork coasters. I`d like to find a better solution, but I don`t really want to use glue. I am thinking to get a non slip mat, but searching for better alternatives.
What would you use?

Both, the turntable, and the int. amp sitting on a DIY sandbox and plinth. The plinth is a bit smaller than the box, so It`s not touching the wood corners but sitting on sand. But, handling sand can be messy sometimes.
What would you mix with the sand so It`s not creating dust?
128x128korakotta
Springs that don't bounce. Concrete floors that float. Scare quotes and "whatchamacallits".  

You have entered a land of mystery and imagination. The sign post ahead: You have entered the Audiogon Zone.
Post removed 
By the way...
 You can pick up a "Vibration meter", fairly cheap and then actually measure what is going on. Or make one even cheaper. All you need is an laser accelerometer array. Some mirrors and etc. That's what I did.