I learned the hard way that the open end of a 3⁄4" pipe can put a real ding in a workpiece or your noggin if you're not careful when handling your pipe clamps.

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I learned the hard way that the open end of a 34 " pipe can put a real ding in a workpiece or your noggin if you're not careful when handling your pipe clamps. To prevent future mishaps, I bought some 1" rubber cane tips and installed them on the ends of all my clamps.
—Don Swanson, Plaistow, N.H.