https://squareblogs.net/gramra....bbit4/guide-to-bifol
Bi Fold Door Repairs Bi fold doors can be difficult to operate if the hardware is damaged. The top hinges, as well as the bottom rollers, are among the most commonly damaged components that require repair or replaced. Dust and dirt can hinder the track of the door which can cause it to stick. This is a simple solution by getting rid of the dirt and then cleaning. Fixing the hinges Bi-fold doors are ideal for opening the space. They also have their challenges. One of the m