Basically that's what I had in mind, but MDF wont work. You would need to use a material that is nonporous for your table (azek,corian,phenolic sheet,hdpe,possibly melamine?) and direct all of the vacuum to that area right under the puck, it needs to be absolutely air tight all around. With a high vacuum pump you could run a tube to each individual pocket. Here's a link with lots of good info on vacuum clamping. http://www.joewoodworker.com/veneeri...umclamping.htm