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DIY Bifold Door Roller Replacement The bifold door roller is a frequent point of failure in internal light-weight folding doors. A simple DIY solution is available to fix the issue. The rollers are constructed of stainless steel and are impervious to breakage. They are simple to install using the supplied hardware. They also bear loads and designed for smooth operation. Nylon Wheel Nylon is a thermoplastic product with excellent mechanical properties. It can withstand large load capacities and occasional