I keep meaning to make one of these. I always forget until I need to tap a hole.I was reminded of this when reading Fab Kevin's article in "The Horse" about turning front Fatboy wheels into rears. He was starting his tapped holes in the drill press.
This is a tap wrench that fits on to the drill chuck. The allen screw snugs into one of the chuck key's holes. It works pretty good, and insures that the threaded holes are straight and perpendicular to whatever is resting on the drill press table.