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DIY Bifold Door Roller Replacement The bifold roller is the most frequent failure point in internal folding doors. A simple DIY solution is available to solve the problem. The rollers are made of stainless steel and are resistant to breakage. They are easy to install using the supplied hardware. They are also load bearing and are designed to run smoothly. Nylon Wheel Nylon is a thermoplastic product with excellent mechanical properties. It is able to withstand large loads and even some