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DIY Bifold Door Roller Replacement The bifold roller is the most frequent failure issue in doors that fold internally. A simple DIY fix is available to solve the problem. The rollers are made from stainless steel and are resistant to breakage. They are easy to install with the included hardware. They are designed to be load bearing and smooth in operation. Nylon Wheel Nylon is a Thermoplastic material that has excellent mechanical properties. It is able to withstand heavy load cap