Abstract: An elongated rod, such as a golf putter, has a permanent magnet secured at one end. A golf ball position marker of magnetic material is releasably held on the end of the putter by the magnetic attraction between the magnet and the material of the marker. The marker is placed in position by maually lowering the end of the putter carrying the marker onto the surface of the putting green exerting pressure on the putter to press the marker into place. The putter is then moved parallel to the surface of the green to slide it off of the marker, the marker being retained in position by a projection on the lower side engaging the surface of the green. The marker is removed by bringing the magnet back into contact with the marker and then lifting it vertically to pull the marker away from the surface of the green.