Using flush-cutters, blunt cut the end of your wire.
Place the wire so it spans the width of the concave barrel.
Compress the handle of the pliers. The wire will conform to the shape of the barrel and start the loop.
Without releasing the wire from the pliers, and using your non-dominant hand, press the wire against the round-nose barrel to complete the loop.
Release the handle of the pliers and rotate the wire so the outside edge of the concave barrel is at the base of the loop--rotate your wrist about 15 degrees, positioning the loop on top of the straight length of wire.
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