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Fixing French Door Locking Mechanism Replacement When you lock your french doors, it is important to ensure they're secure. This can be achieved by choosing the right lock that will keep your door secure while not blocking airflow or affecting the aesthetics of your room. French door locks typically have three-point locking systems that includes flush bolts on the upper and lower edges of each door panel, and an opening lockset that can be opened. This lock is extremely hard to break. How to fix the problem