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DIY Bifold Door Roller Replacement The bifold door roller is a typical point of failure in internal doors that are light-weight. A simple DIY fix is available to fix the issue. The rollers are constructed of stainless steel and are impervious to breakage. They are easy to install using the included hardware. They are designed to be load bearing and have a smooth operation. Nylon Wheel Nylon is a thermoplastic material with excellent mechanical properties. It can withstand heavy loads a