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DIY Bifold Door Roller Replacement The bifold roller is the most frequent failure problem in internal folding doors. A simple DIY solution is available to fix the problem. The rollers are made from stainless steel and are resistant to breaking. They are easy to install using the included hardware. They also bear loads and are designed to run smoothly. Nylon Wheel Nylon is a thermoplastic material with excellent mechanical properties. It can withstand heavy loads and even some impact without b