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Bi Fold Door Repair - How to Fix Leaning Doors Without Removing the Hinges Bi-fold doors can be a fashionable and practical method to connect your outdoor and indoor areas. Like all door systems, they must be maintained in a way that they function correctly. This can be accomplished by cleaning and lubricating the entire mechanism including the lock to ensure they work smoothly. This will help prevent issues that could cause them to fall or become out of alignment. F