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DIY Bifold Door Roller Replacement The bifold roller is the most frequent failure problem in internal folding doors. The problem is easily fixable by using a simple DIY solution. Bifold door rollers made of stainless steel resist breakage for long term use. They are designed to be easily installed using the hardware that is included for easy installation. They are designed to be load bearing and operate with ease. Nylon Wheel Nylon is a thermoplastic product with ou