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When It's Time For Patio Door Lock Replacement If your patio door lock isn't functioning correctly, it could be time for a replacement. It's a fairly simple process. The first step is to identify the type of lock you own. This is done by looking at the keyway's position on the lock assembly. Some keys have vertical keyways while others are bent at 45 degrees. Identifying Your Existing Lock The patio door is one of the most targeted points of access to homes for burglars. This is because it typically