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The Odometer Method in locksmithing refers specifically to a technique used for counter-populating from TMK (Top Master Key) combinations. This method allows locksmiths to efficiently determine all the possible key bittings based on the combinations from a master key system. By utilizing the Odometer Method, locksmiths can streamline the process of creating and managing keys, especially in systems that require multiple levels of access.

This method uses a systematic approach to track combinations, making it easier to generate the necessary key cuts, especially in complex keying systems. It is particularly valuable when dealing with master key arrangements where there might be numerous combinations to consider, ensuring accurate and effective key duplication and management.