| 摘要 |
A putter for improving a golfer's putting game having a shaft attached to a head having a hitting surface, top surface, and a bottom surface. An aperture being defined on both the top surface and bottom surface. A ball disposed within the head and protruding through both the apertures of said top surface and bottom surface. The ball being both removeable and mounted to roll only in the direction perpendicular to the hitting surface.
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