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DIY Bifold Door Roller Replacement The bifold door roller is a common problem in internal doors that are light-weight. The problem is easily fixable by using an easy DIY solution. The rollers are made from stainless steel and are resistant to breakage. They are easy to install with the included hardware. They are also load bearing and designed to operate smoothly. Nylon Wheel Nylon is a thermoplastic substance that has excellent mechanical properties. It is able to withstand lar