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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. Bifold door rollers made of stainless steel are resistant to breakage for long-term use. They are designed to be installed easily with the hardware that is included for easy installation. They are designed to be load bearing and smooth in operation. Nylon Wheel Nylon is a thermoplastic product with outstanding mechanical pr