For a quick, customizable sanding block that perfectly fits inside a groove or dado, just wrap a pair of wood shims with a piece of sandpaper.

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For a quick, customizable sanding block that perfectly fits inside a groove or dado, just wrap a pair of wood shims with a piece of sandpaper. To widen the block, simply slide the thicker ends of the shims closer together.
—Joseph Gauthier, South Barrington, Ill.