I'm running a 36 x 36 CNCN router, mostly making inlays for custom woodwork. I've struggled with hold-down issues since the beginning. I cut 1/8" wood for the inlays and have been breaking about 70% of the inlys when trying to remove them from the spoil board. Vacuum hold-downs don't work because I have to cut all the way through the inlay stock. After many, many iterations, I've stumbled onto the best solution. I use a well-polished phenolic spoil board and use 3M9576 double-sided tape to hold 3/32 balsa to it. Then I use the tape again to stick the inlay material to the balsa. The balsa is easy to cut through, either with a VERY sharp putty knife or a fine-bladed bandsaw. The tiny inlays come off without a problem. The 9576 tape is teh best approach I have found for this method. The adhesive rolls off easily, leaves NO residue and holds very well. The bals is much more stable than nay type of styrofoam board I've thried and relatively inexpensive. I put the balsa down in 1/2" wide strips with the grain going across the tape. Most of the tape and its adhesive comes up easily and the rest rolls right off under thumb pressure. My biggest problem is getting a blister rubbing the adhesive off!