Try Coffee-Can Lids as Saw-Blade Spacers
If you stack your tablesaw or circular-saw blades for storage or transport them to a sharpener, you need spacers between them to prevent the carbide teeth from chipping each other. But rather than go to the trouble and expense of cutting out hardboard or plywood spacers, just save a few of the plastic lids that come on three-pound coffee cans. Bore a hole the size of your saw's arbor in the center of these and place them between your blades.
—Ken Kraft, Boise, Idaho