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DIY Bifold Door Roller Replacement The bifold roller is the most frequent failure issue in doors that fold internally. The issue can be fixed with a simple DIY solution. The rollers are constructed of stainless steel and are resistant to breakage. They are simple to install using the supplied hardware. They are also load bearing and are designed to run smoothly. Nylon Wheel Nylon is a Thermoplastic material with excellent mechanical properties. It is able to withstand large loads and even some impacts wit