A hand-held plunge router can be a great tool for cutting mortises. The key to precise results is guiding the router accurately so the sides of the mortise end up perfectly smooth, straight, and parallel to the faces of the workpiece. Clamping the workpiece in place only takes a second. Then, it’s a simple task to adjust the table and stops to locate the mortise on the workpiece. Once everything is locked in place, you can knock out identical mortises quickly, easily, and accurately.