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DIY Bifold Door Roller Replacement The bifold door roller is a typical problem in internal doors that are light-weight. A simple DIY solution can be found to fix the problem. Bifold door rollers made of stainless steel resist breakage for long term use. They can be easily installed using the hardware included for straightforward installation. They are designed to support loads and have a smooth operation. Nylon Wheel Nylon is a thermoplastic material with outstanding mechanical properties.