Very simple jig to cut tight dadoes: just a rectangular piece of wood and a metal screw. Photo 1 by Don Tai
Obsessive, I sometimes am, but for getting tight dadoes it is crucial. Without tight dadoes joints are not as strong. I do not have nor cannot justify a dado set, so need to use my single blade. I was going to build a 2 part kerfmaker, when I found this very simple kerfmaker design that uses a single piece of rectangular wood and a screw. Well, I just had to try it. It works exceedingly well, resulting in tight dado joints.