: if all door locks are different and different keys open different locks, how does a universal key work?
In: Engineering
A standard lock has pins with different lengths that correspond with the lengths of the notches/ridges on the key. When the right key is inserted, the pins are aligned and the lock can rotate freely.
With a master key, the pins in the lock are segmented so that they can align with two different lengths of notches/ridges. Locks that share a master key all have the same lengths for the first segment but different lengths for the second segment.
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