Training device for putting golf balls

A training device of the type adapted for use for putting a golf ball, said device including a putting head and which mounts a shaft adapted to carry a handle for putting the golf ball, said putter head including an elongated cavity which opens onto the bottom surface thereof, a reel assembly including a reel member disposed for rotational movement within said cavity, said reel member including a plurality of axially spaced disc elements having ground engaging surfaces, each of said disc elements including a substantially circular body having tapered side surfaces which extend outwardly and inwardly so as to imerge into a peripheral apex edge surface adapted for a substantially line-contact tracking action with the putting surface, said disc elements being defined also by unitary, radial spacer members which provide generally inverted, frusto-conical grooves between adjacent of said disc members, with said peripheral apex edge giving a line-contact across the putting surface to maximize the tracking ability of the putter head to insure a straight in-line back and forward putting stroke.