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DIY Bifold Door Roller Replacement The bifold door roller is a typical point of failure in internal doors with light weights. The problem is easily fixable by using an easy DIY solution. The rollers are made of stainless steel and are impervious to breakage. They are easy to install with the included hardware. They are designed to support loads and smooth in operation. Nylon Wheel Nylon is a thermoplastic product with excellent mechanical properties. It is able to withstand large loads and