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Wrap 18-gauge wire around the top of the jar, just under the bottom lip, twice. About 18 inches of wire should do the trick, depending on the size of the jar.
Take the shorter, loose end of the wire and tie a knot on the right side of the jar. Leave about 3 inches of wire hanging freely out to the side.
Wrap the shorter, loose end of the wire around the long end several times.