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DIY Bifold Door Roller Replacement The bifold door roller is a typical issue with internal doors that are light-weight. A simple DIY solution is available to fix the issue. Stainless steel bifold door rollers resist breakage for long term use. They are designed to be easily installed using the hardware that is included for easy installation. They are designed to be load bearing and have a smooth operation. Nylon Wheel Nylon is a Thermoplastic material with exceptional mechanical propertie