| 摘要 |
PROBLEM TO BE SOLVED: To make it possible for anyone to adjust a guard nail easily and exactly without experience or intuition by setting a projection part on the top of gauge sphere to always set the gauge sphere so as to position at the fixed distance from a game board. SOLUTION: Gauge spheres 2, 2 are fixed on one or both ends of handle 1 and projection parts 3, 3 which are for separating the gauge sphere 2, 2 from the face of game board 9, are set on the tops of gauge sphere 2, 2. Then the top face 8 of projection parts 3, 3 is formed of the spheres that has the same center as that of the gauge spheres 2, 2.
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