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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 solution is available to solve the issue. The rollers are constructed of stainless steel and are impervious to breakage. They are easy to install using the included hardware. They also have load bearing and designed to operate smoothly. Nylon Wheel Nylon is a thermoplastic product with outstanding mechanical properties. It is able to withstand large loads and even some impacts without breaking, which makes it a great ch