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DIY Bifold Door Roller Replacement The bifold roller is the most frequent failure point in internal folding doors. The issue is easily fixed by using a simple DIY solution. Bifold door rollers made of stainless steel resist breaking for long-term use and are designed to be installed easily with the hardware that is included for easy installation. They also bear loads and designed to operate smoothly. Nylon Wheel Nylon is a Thermoplastic material with exceptional mechanical properties. It can w