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DIY Bifold Door Roller Replacement The bifold door roller is a frequent problem in internal light-weight folding doors. A simple DIY fix can be found to fix the problem. The rollers are made of stainless steel and are resistant to breakage. They are easy to install using the included hardware. They are also load bearing and designed to operate smoothly. Nylon Wheel Nylon is a Thermoplastic material with exceptional mechanical properties. It can withstand heavy loads and even some impact witho