I'm getting ready to build a workbench from the plans in the Family Handyman magazine from a couple of months ago. It calls for untempered hardboard to cover the ends of some oak plywood that is cut to a 24" radius. Veneers won't work becuase there are two pieces of 3/4"plywood with a 1.5" gap between them that needs to be covered. My problem is finding untempered hardboard. The tempered stuff is carried at HD and Lowes but not untempered. Any ideas on where to find it or alternative solutions?