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DIY Bifold Door Roller Replacement The bifold roller is the most common failure issue in doors that fold internally. The issue is easily fixed by using a simple DIY solution. The rollers are made from stainless steel and are resistant to breaking. They are simple to install using the supplied hardware. They are designed to be load bearing and operate with ease. Nylon Wheel Nylon is a thermoplastic material with outstanding mechanical properties. It can withstand heavy loads and even some impacts w