I like Mike's idea, but of course lead is a substance even more toxic than coffee, so many will object to its use.
Something else that works is shrink-wrap tubing obtainable at Radio Shack or hardware stores for use in insulating wires. You put a little piece on the end of the cable and heat it with a lighter (more environmental hazards, sorry) and voila (sorry I don't have time for accent marks tonight) the job's done.
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