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DIY Bifold Door Roller Replacement The bifold roller is the most frequent failure point in internal folding doors. The problem is easily fixable by using an easy DIY solution. The rollers are constructed of stainless steel and are resistant to breakage. They are easy to install using the included hardware. They also have load bearing and designed for smooth operation. Nylon Wheel Nylon is a Thermoplastic material with excellent mechanical properties. It is able to withstand heavy l