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DIY Bifold Door Roller Replacement The bifold door roller is a frequent problem in internal light-weight folding doors. A simple DIY solution can be found to fix the problem. Bifold door rollers made of stainless steel are resistant to breakage for long-term use. are designed to be installed easily with the hardware that can be easily installed. They also have load bearing and designed for smooth operation. Nylon Wheel Nylon is a thermoplastic material with outstanding mechanical properties. It can