Lots of things, including wood scraps, work great for cushioning steel clamp jaws from delicate workpieces.

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Lots of things, including wood scraps, work great for cushioning steel clamp jaws from delicate workpieces. I've found that furniture pads—the thick felt type that self-sticks to the bottom of furniture—the best solution. They cost little, stay in place without help during clamp positioning, and provide plenty of cushion.
—Joe Murphy, Oceanside, N.Y.