When driving screws or nails into a joint, I would either eyeball the row of fasteners (which sometimes sent them splitting out the back of the joint) or, if I was in a perfectionist mood, measure and mark a line (one I would later have to sand off). But recently, I stumbled on a third option: this simple edge-nailing gauge, inspired by the shape of a flat pry bar. The gauge not only helps me place the fastener dead center every time, it also helps steady the fastener, limits hammer dings, and makes a tidy row of the exposed heads. The gauge works so well, I made several more for different stock thicknesses. —R. B. Himes, Vienna, Ohio