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DIY Bifold Door Roller Replacement The bifold door roller is a common problem in internal doors with light weights. The issue is easily fixed with a simple DIY solution. The rollers are made of stainless steel and are impervious to breakage. They are simple to install with the included hardware. They also have load bearing and designed to operate smoothly. Nylon Wheel Nylon is a thermoplastic product that has excellent mechanical properties. It is able to withstand large loads a