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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 fix can be found to fix the problem. Stainless steel bifold door rollers are resistant to breakage for long-term use. They are designed to be installed easily with the hardware that is included for easy installation. They are designed to be load bearing and have a smooth operation. Nylon Wheel Nylon is a thermoplastic subst