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DIY Bifold Door Roller Replacement The bifold roller is the most frequent failure problem in internal folding doors. The issue can be fixed with a simple DIY solution. The rollers are constructed of stainless steel and are resistant to breaking. They are simple to install using the supplied hardware. They are designed to support loads and smooth in operation. Nylon Wheel Nylon is a thermoplastic substance that has excellent mechanical properties. It is able to withstand lar