https://botdb.win/wiki/9_Signs...._That_Youre_A_Bi_Fol
Bi Folding Door Repair Tips Bi-fold doors enable you to fully open up a space and connect indoors with outdoors. They are ideal to let the sun and fresh air in, however they need to be maintained properly to avoid damage. You may encounter a number of problems with your bi-folding door. Fortunately, they're not difficult to repair! Cracked Pivot Pins If you've recently installed carpeting or changed the flooring material in your home, you could notice that your bi folding doors scrape along the bottom. Th