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Bi-Fold Door Repair They can be either exterior or internal, bifold doors provide a certain amount of flexibility that can be customised to meet any need. However, as with all fixtures and fittings, they can be susceptible to wear and tear. It's not difficult to restore them to a good condition. With a bit of patience and basic woodworking knowledge, you can tackle a few easy bi-fold door repair projects. Cracked Corners Bifold doors are usually light and can break near the pivot points on the top and bottom.