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DIY Bifold Door Roller Replacement The bifold door roller is a typical problem in internal doors with light weights. A simple DIY fix is available to fix the issue. Stainless steel bifold door rollers are resistant to breakage for long-term use. They can be easily installed with hardware that can be easily installed. They are also load bearing and designed to operate smoothly. Nylon Wheel Nylon is a Thermoplastic material that has excellent mechanical properties. It can withstand heavy loads and even some imp