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Bi-Fold Door Repair If they are either external or internal, bi-fold doors provide flexibility that can be customised to meet any need. However, as with all fixtures and fittings, they may be subject to wear and wear and tear. Fortunately, it's not too difficult to restore them to good condition. You can fix your bi-fold doors with a little patience and some basic woodworking skills. Cracked Corners Bifold doors are typically lightweight and can crack near the pivot points