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DIY Bifold Door Roller Replacement The bifold door roller is a common issue with internal light-weight folding doors. A simple DIY fix is available to solve the issue. Stainless steel bifold door rollers resist breakage for long term use. They are designed to be installed easily with the hardware included for straightforward installation. They are also load bearing and designed to operate smoothly. Nylon Wheel Nylon is a thermoplastic substance that has excellent mechanical properties