The next time you need small clamps, try filing off the teeth of some jumper-wire clips used by electricians.
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TRY JUMPER-WIRE CLIPS FOR SMALL CLAMPING JOBS

The next time you need small clamps, try filing off the teeth of some jumper-wire clips used by electricians. (You'll find these clips in the electrical-supply section at most hardware stores.) The clips exert a lot of pressure, and their jaws open up to about 34 ".
—Harrold Keith, Cobble Hill, B.C.