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Bi-Fold Door Repair If they are either internal or external, bi-fold doors provide flexibility that can be tailored to meet any need. Like all other fixtures and fittings they can be subject to wear and tear. Thankfully, it's not hard to get them back into good shape. With a bit of patience and basic woodworking knowledge, you can tackle a couple of easy bi-fold door repair projects. Cracked Corners Bifold doors are typically lightweight and may crack near the pivot points on the top and bottom