斷掉的好朋友
Good discussion!
To add: All froeds are spring-loaded device. The discussion thus far focuse on its mechanical failure, and failure associated with broken part only. Other possibilities exist, however, which are not related to breakage of any kind.
For example, a friend\'s spring becomes too rusted or soft and therefore cannot exert enough power, however marginal this latter can be, to prop cams such that they can bite on the rock when pressure are onto them. When this happens, the above mentioned bottom-top/shallow placement can pop off without any breakage.
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