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I have heard of the tool being a piece of brass round stock that had a very small tight tolerance hole drilled off center in it lengthwise. It is inserted in the port after the threaded brass plug is removed, the hole is clocked to particular position (12 o'clock?) and then a correctly sized drill is inserted in the hole and then by using a pin vise twisted with your fingers you create the new hole through very thin metal in the carb bore.
Having access to a Bridgeport Mill would also allow the hole to be very accurately located.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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