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A key component that allows a combination to be changed in a lock is the hub. In many combination locks, the hub acts as the central mechanism that houses the internal workings required for the lock to operate. When changing a combination, access to the hub is often necessary, as it typically contains the gears or mechanisms that align with the dial or keypad. By altering the hub's settings or configurations, a new combination can be set, which is essential for maintaining security and control over who can access the locked area.

The other options do not play a role in changing a combination. For example, the finish pertains to the surface treatment of the lock and does not influence the mechanism. The knob screw is related to the assembly of the lock, securing the knob in place, but does not facilitate the change of combinations. Edge-bore refers to the preparation of the door for the lock installation and is not involved in the operational complexities of changing a lock's combination.