| 摘要 |
The darts (1) are each made in injected plastic material and the axis shaft (3) has a thread (5) at its lower end (9). A metallic cap (2) is fixed to this and forms a weight. The other end (7) of the dart is long enough to be held. The feathers have three blades (4) to give good stability. The metallic cap has a narrower lower end (8) by which it penetrates into the ground. At its upper end there is a cylindrical thread to screw it on to the dart.
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