Changing a door lock cylinder is a task that many homeowners and renters may face at some point, whether it's due to a lost key, a malfunctioning lock, or the need for upgraded security. But what happens when you don't have the key? The good news is, you can still replace a lock cylinder without a key—though the process requires some knowledge, patience, and the right tools. This guide breaks down everything you need to know about how to change a door lock cylinder without key, including types of lock cylinders, essential tools, step-by-step replacement instructions, and when it's best to call in a professional.
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