The practice of changing the internal mechanism of a lock so that a different key operates it is a common security measure. This process renders existing keys useless, enhancing security without requiring replacement of the entire lock hardware. For example, a homeowner might consider this service upon moving into a new residence to prevent unauthorized access.
The primary benefit of this service lies in its cost-effectiveness compared to complete lock replacement. It provides an efficient and swift method to regain control over property access, especially following events like lost or stolen keys, or changes in tenancy. Historically, locksmiths were the sole providers, but an increasing number of retail establishments now offer this convenience.