What is a master key system, and how does it work? Can a locksmith design and install a master key system for my home or business, and what are the benefits of using one? What are some common types of master key systems, and how do they differ from one another here? How can I ensure the maximum security of my property when using a master key system? Can a locksmith repair or rekey a malfunctioning master key system, or is it always necessary to replace it entirely? What are some best practices for managing and maintaining a master key system?