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DIY Bifold Door Roller Replacement The bifold roller is the most frequent failure issue in doors that fold internally. The issue is easily fixed by using an easy DIY solution. Stainless steel bifold door rollers resist breaking for long-term use. They are designed to be easily installed with hardware included for straightforward installation. They also have load bearing and designed to operate smoothly. Nylon Wheel Nylon is a thermoplastic substance with excellent mechanical prop