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Bi Fold Door Repair - How to Fix Leaning Doors Without Removing the Hinges Bi fold doors are an elegant method to expand your home and connect indoor and outdoor spaces. Like all door systems, they must be maintained correctly to function correctly. This can be done by cleaning and lubricating the entire mechanism, including the lock, to ensure that they function smoothly. This will help avoid issues that could cause them to drop or become out of alignment. How to Fix a Leaning door It