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DIY Bifold Door Roller Replacement The bifold door roller is a typical problem in internal doors with light weights. The issue is easily fixed by using an easy DIY solution. The rollers are made of stainless steel and are impervious to breakage. They are simple to install using the included hardware. They are designed to support loads and smooth in operation. Nylon Wheel Nylon is a Thermoplastic material that has excellent mechanical properties. It can withstand heavy loads and ev