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DIY Bifold Door Roller Replacement The bifold roller is the most common failure issue in doors that fold internally. The problem is easily fixable by using a simple DIY solution. The rollers are constructed of stainless steel and are resistant to breaking. They are easy to install with the included hardware. They are designed to be load bearing and smooth in operation. Nylon Wheel Nylon is a thermoplastic product with outstanding mechanical properties. It is able to withstand