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How to Repair Bifold Door Bottom Pivots The misalignment of your doors could be the cause of your bifold doors sagging and scraping on the floor. A few minor adjustments will get them back on track and running smoothly. The bottom pivot is attached to the bracket base or floor to provide a sturdy, secure mounting. It is threaded to allow for adjustment. kit can be used with a wide range of bi-fold doors. Anchor or pivot