I wondered same thing. It does take some planning and they are not available at the local big box store, so that's an impediment. In grad school, we used them.o Thrust like stage, heavy (16 ounce?) canvas, hemmed (after first painting) to fit, grommets, 5/16 x 1 fhms, and knife edge threaded inserts. IIRC they could be reused (repainted) several times, and of course the inserts could be used for many years. It would seem adding the inserts in the pit filler would be an acceptable permanent addition.Doesn't anyone use ground cloths any more?
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