Abstract: A golf club, as disclosed a putter, having an interchangeable runner on the bottom that is held in place with screws or double-sided adhesive tape. The runner is capable of being shimmed or changed by an individual golfer to vary the vertical height or thickness in order to raise or lower the face of the club and thus adjust the position of the "sweet spot" of the club face. The desired location of the sweet spot is determined by finding the center marking of the normal ball input point distribution for a plurality of impact points on a marking tape placed on the face of the club. A sighting line also can be aligned with the center of the pattern of impact points.