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DIY Bifold Door Roller Replacement The bifold roller is the most common failure issue in doors that fold internally. A simple DIY fix can be found to fix the problem. Bifold door rollers made of stainless steel resist breakage for long term use and are designed to be easily installed using the hardware that can be easily installed. They also have load bearing and designed for smooth operation. Nylon Wheel Nylon is a thermoplastic product with outstanding mechanical properties. It is able to withstand la