I already have one. But it will be of no use when trying to cut a straight 15" long slot. The only way I can see to do it; is to draw a line along the hinge line, then try to cut it as straight as you can with an exacto blade. At least to get started. The GP hinge slot cutter is a great tool; but it is really hard to get this tool to make a straight intial cut even for a 3/4" hinge.