底座封闭于槽孔，其顶面中央设有供掣动件及抗扭弹簧套设的凸轴，并设有供以热熔性固着剂固定钢珠的穿孔；
The center of the braking piece is provided with the through hole which is sheathed on the convex shaft and the top face is provided with an upright shifting piece.
底座封闭于槽孔，其顶面中央设有供掣动件及抗扭弹簧套设的凸轴，并设有供以热熔性固着剂固定钢珠的穿孔；
The center of the braking piece is provided with the through hole which is sheathed on the convex shaft and the top face is provided with an upright shifting piece.
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