Notice that the axle bolt is higher than where the cams touch the rock. This is what provides the (approximately) 4:1 mechanical advantage that keeps the CAM secure, even in a smooth, parallel crack.

请注意，中轴上的螺丝高于接触岩面的位置，正是这点提供了(大约)4：1的机械势能，即使是在光滑、平行的岩缝中，也保证了凸轮的安全性。

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Variable play cam is the effective number of the control spring, and the height of the bolt adjusting spring;

变剧凸轮是控制弹簧的有效圈数，节距刀下面螺栓调节弹簧高度；

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Variable play cam is the effective number of the control spring, and the height of the bolt adjusting spring;

变剧凸轮是控制弹簧的有效圈数，节距刀下面螺栓调节弹簧高度；

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