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DIY Bifold Door Roller Replacement The bifold roller is the most frequent failure point in internal folding doors. A simple DIY solution can be found to fix the problem. Bifold door rollers made of stainless steel resist breaking for long-term use. They can be easily installed with hardware that can be easily installed. They are designed to be load bearing and operate with ease. Nylon Wheel Nylon is a Thermoplastic material wi