A device to aid golfers in improving their putting game comprising in combination with a putter, a straight edge guide and an attachment for the putter head, the putter head attachment comprising an elongated flat vertical base plate which extends horizontally and is adapted to slide against a horizontal flat surface on the guide, a first vertical arm extending perpendicularly in a vertical plane from the base plate, a horizontal arm extending from an upper edge of the first vertical arm in a horizontal plane from an end of the first vertical arm opposite its attachment to the base plate, the horizontal arm extending in spaced relation with respect to the base plate, the horizontal arm forming a right angle with the first vertical arm so as to extend over an uppermost portion of the putter head, a second vertical arm attached to an end of the horizontal arm opposite from its attachment to the first vertical arm and extending downwardly in parallel relation with the first vertical arm, the putter head being grasped between the first and second vertical arms.