How about a granite platform with Vibrapods or IsoBlocks. I have had success using this method. I have some 3/4" x 18 x 18" granite platform on sale here on Audigon and others sell the Vibrapods. Use at least 6-9 pods of the proper type and stagger the direction (large end then small end) Finally, make sure the table or rack your table will be in is stable and not easly rocked. This should do the job at a very modest cost. Good luck, Milo
PS I also offer 1.25 thick platforms as well.
PS I also offer 1.25 thick platforms as well.