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DIY Bifold Door Roller Replacement The bifold door roller is a common problem in internal doors with light weights. The issue is easily fixed with a simple DIY solution. Bifold door rollers made of stainless steel resist breakage for long term use and are designed to be easily installed with hardware included for straightforward installation. They also have load bearing and designed for smooth operation. Nylon Wheel Nylon is a thermoplastic substance with excellent mechanical properties