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；
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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