What should never be removed from the chain connected to the pole or structure?

The self belay key is an essential component of the safety system connected to a pole or structure. It serves as a critical safety feature that ensures users remain securely attached to the safety line while navigating or working at heights. Removing the self belay key compromises the integrity of the safety system, increasing the risk of falls or accidents.

In contrast, the other options—such as the safety gate, primary lanyard, and guest's harness—serve different specific functions within the overall safety apparatus but are designed to be utilized or managed differently depending on the situation. The safety gate, for instance, is used for safe entry and exit, while the primary lanyard provides a connection between the user and safety equipment. Each of these elements supports safety but is intended to be manipulated or adjusted according to established safety protocols, rather than being permanently affixed in the same way as the self belay key.