Abstract: The putter fitting tool and stroke analyzer, called the "fitting tool", is to custom fit a golf club putter to match the composite physical stature and preferred stroking posture of an individual golfer. The tool's lie angle indicator marks when aligned between the eyes and putterhead sight or ball striking point, makes a 90 degree sight plane to the target called "sight plane". The putter is adjusted in manufacturing to match the sight plane specified by the tool. The preferred sight of the system is specially constructed to duplicate the desired sight plane once the tool is removed. This allows the golfer to putt from the same stroking position every time. The sight plane indicator marks or lie angle marks of the tool allow the golfer to try-a variety of sight planes to select the one most suited to his putting posture. The tool, as a stroke analyzer, magnifies deviations from the sight plane (the "sight plane" is the plane which intersects the clubhead, target, and golfer's eye) during the stroke.

Abstract: The putter has a head with a downwardly open cavity and a plate closing the cavity and secured by screws. The club head has a top opening at its heel end and the plate has a through opening in its toe end. The shaft has an extension at its lower end including a first portion bent to pass downwardly through the top portion, a second portion slanting downwardly between the openings, and a third portion extending downwardly into the through opening where it is welded in place. The shaft is of smaller diameters at locations near where it passes through the openings. The shaft is smaller than the top opening so that the shaft can flex within the top opening and give upon initial impact with the golf ball and then later recoil against the golf ball.