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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 solution is available to solve the problem. The rollers are made from stainless steel and are impervious to breakage. They are simple to install using the supplied hardware. They are designed to support loads and have a smooth operation. Nylon Wheel Nylon is a Thermoplastic material with excellent mechanical properties. It can withstand large load