I simply picked up a 1/4" or 3/8" Allen wrench for a couple bucks at a hardware store. Since I didn't have a grinder at the time, the existing hex shape of the wrench was important to me. People worry that the hex shape will mar the edges of the hole in the jack, but I'm not sure why that matters. It is not a precision-made hole, and aside from the hand crank, nothing else will ever be used on it.
Bill
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