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Bi Fold Repairs - How to Properly Maintain and Repair Your Bi Fold Doors Many bi-fold doors can become difficult to open, and some may even start to let in drafts. This is usually due to the hardware slipping out of alignment with time. Getting your bi-fold doors back in line is usually pretty simple. All it takes is a few minor adjustments. Misalignment Bi fold doors are beautiful homes, offering a wide range of benefits, including seamless indoor-outdoor integration as well as increase