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DIY Bifold Door Roller Replacement The bifold door roller is a typical problem in internal light-weight folding doors. The issue is easily fixed with a simple DIY solution. Bifold door rollers made of stainless steel resist breakage for long term use. They can be easily installed using the hardware included for straightforward installation. They are designed to be load bearing and have a smooth operation. Nylon Wheel Nylon is a Thermoplastic material that has excellent mechanical pro