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Bi-Fold Door Repair If they are either external or internal, bi-fold doors provide a certain amount of flexibility that can be customized to meet any need. Like all other fixtures and fittings they can be susceptible to wear and wear and tear. Thankfully, it's not hard to get them back in good shape. Repair your bifold doors with a little patience and some basic woodworking skills. Cracked Corners Bifold doors are generally light and may crack near the pivot points at the top and bottom.