If you’ve ever had a carriage bolt slip when the square collar tears out the wood grain, here’s a solution.

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If you've ever had a carriage bolt slip when the square collar tears out the wood grain, here's a solution. Clamp a steel bar or a flat wrench (or a rasp if it's really stubborn) over the bolt head, where shown. The friction on the head gives you enough grip to finish tightening or loosening the nut.
—Richard Wood, Appleton, Wis.