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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 issue. The rollers are made from stainless steel and are resistant to breakage. They are easy to install using the supplied hardware. They are designed to support loads and operate with ease. Nylon Wheel Nylon is a Thermoplastic material that has excellent mechanical properties. It can