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DIY Bifold Door Roller Replacement The bifold door roller is a frequent point of failure in internal doors with light weights. A simple DIY solution is available to solve the problem. The rollers are made of stainless steel and are impervious to breakage. They are simple to install with the included hardware. are designed to support loads and smooth in operation. Nylon Wheel Nylon is a Thermoplastic material with excellent mechanical properties. It can withstand heavy loads and e