I've seen machinists use a small block with a bunch of holes in it where the tap would be inserted to guarantee that the tap threads straight into the hole to be threaded. I could simply drill a clearance hold in some scrap metal, but if I wanted to machine such a guide,there must be some good ideas out there. It could be a rectangular solid with a row of holes different diameters, it could be a disk, etc. What do most people use?
I know of other techniques using the drill press chuck, a spring- loaded tap guide, etc, but in this application, I would like a simple guide.
Jim