US Patent 7481714 Wheeled putter

The wheeled putter is a putter using a shrink fit process to secure the putter head to wheels in order to provide a training putter that ensures a uniform putting height above ground. The wheeled putter includes a putting head and a pair of wheels mounted onto the putting head. The wheels each have a bearing assembly mounted in the wheel hubs. The putter head is cooled, thus shrinking the putter head, which is then pressed into the bearing assembly. When returned to room temperature, the putter head is secured directly against the bearing assemblies of the wheel by expansion of the axle shaft against the bearing assembly.