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Once you have the spring assembly tuned up, its time to put on the new foam. The foam from OPG already has a woven backing impregnated to the bottom, protecting the foam from the springs. As an added layer of protection and to provide a better surface to glue the foam down, we recommend covering the spring assembly with a cheap piece of material like velour. Hold the material in place with hog rings along the perimeter and along the center hold-down wires.