If you're low on gear and forced to use a single-point anchor, try to install an unweighted safety backup, then send the big guy down first (figure 5).
如果器材短缺，只能使用单点下降锚点，就需要做一个不受力的备份，然后让体重大的人携带背包先降下去(图5)。
The backup tong should be snubbed to the substructure or to an anchor post attached to the substructure.
内钳的钳尾绳应到底座或固定在底座上的钳尾桩上；
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