This may be a dumb question, but the more I do, the more I am finding a need for this. Is there a good tool for finding the center on the end of boards, boards that are NOT square (or round dowels). Of course I have a number of centering rulers, but the lines I draw from those are sometimes off a hair and the result can be extra planing/sanding (on joining pieces with a floating tenon for example). Ideally I would like a tool that lets me find the center on each edge and let me draw a line simultaneously. Has to exist right?