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DIY Bifold Door Roller Replacement The bifold door roller is a frequent problem in internal doors with light weights. A simple DIY fix is available to fix the problem. Bifold door rollers made of stainless steel resist breakage for long term use. They are designed to be easily installed using the hardware that is included for easy installation. They also have load bearing and designed to operate smoothly. Nylon Wheel Nylon is a thermoplastic