Next time you need to mark the center of a workpiece, slide the 0" ends of two steel rules together and fasten them with a piece of tape or a rare earth magnet.

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Next time you need to mark the center of a workpiece, slide the 0" ends of two steel rules together and fasten them with a piece of tape or a rare earth magnet. Adjust the rules on the workpiece until the measurement at the edges reads the same on both rules, then mark the center where the rules meet.
—George Schok, Churchville, Pa.