https://stairways.wiki/wiki/10...._Bifold_Doors_Repair
How to Repair of the bifold closet door could be loosened and scrape the floor. This can be fixed by loosening up the screw that holds the top bracket. The top pivot pin is made of a metal screw which fits into a cap made of plastic that has a rounded top and stays in the track above the front door. You'll also require a screwdriver, or perhaps an assortment of pliers. Take off the pin at the bottom. Bifold doors are ideal to save space in closets but they may begin to slide or scratch against the floor