I have made a case that will hold my Worksharp and all of its parts. On one side I have a compartment where I will store the plate glass wheels. I was hoping to find something like the packing foam that I could cut out slots for each of the wheels so they are held securely and well protected. The issue is where I can buy such a thing. Don't really want Styrofoam, but was thinking like the thick spongy foam that allot of things get shipped in. Any ideas?