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When It's Time For Patio Door Lock Replacement If your patio door lock doesn't work properly, it may be time to replace it. It's a pretty simple procedure. The first thing you need to do is determine the type of lock you own. You can do this by observing the location of the keyway in the lock assembly. Certain keyways are vertical, while others are at an angle of 45 degrees. Identifying Your Lock's Existing Lock The patio door is a popular point of entry for burglars. It is because the patio door is typi