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Bi-Fold Door Repair Whether they are internal or external, bi-fold doors provide a certain amount of flexibility that can be customized to meet the needs of any homeowner. Like all fixtures and fittings, they can be susceptible to wear and tear. It's not difficult to restore them to good condition. You can repair your bi-fold doors using some patience and basic woodworking skills. Cracked Corners Bifold doors are typically lightweight and can crack near the pivot points at the top