When you need a little extra torque for tightening smallish knobs on shop tools and jigs, try this shop-made wrench.

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When you need a little extra torque for tightening smallish knobs on shop tools and jigs, try this shop-made wrench. The larger diameter makes it easy on hands and increases your leverage. Simply trace the shape of the knob on a scrap of wood, and scrollsaw or jigsaw the opening to shape.
—Steven Waskewicz, Elbert, Colo.