If you are going to cut a hatch, it helps to first put down masking tape, then draw the hatch outline. The tape helps keep the cut from wandering and the edges cleaner. If you go Speedracemntrixie's route, which is what I usually do, put a cut off allen head bolt in the end of the high speed needle (I think 2-56 fits) and secure with the set screw. Then all you need is a tiny hole for a 2-56 ball driver to fit through. Much less noticeable and the ball driver makes adjusting the needle much easier, particularly fine adjustments.