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DIY Bifold Door Roller Replacement The bifold door roller is a typical problem in internal doors that are light-weight. A simple DIY solution can be found to fix the problem. The rollers are made from stainless steel and are resistant to breakage. They are simple to install using the included hardware. They are designed to be load bearing and smooth in operation. Nylon Wheel Nylon is a thermoplastic material with outstanding mechanical properties. It can withstand