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DIY Bifold Door Roller Replacement The bifold door roller is a typical problem in internal doors with light weights. The issue is easily fixed by using a simple DIY solution. The rollers are constructed of stainless steel and are resistant to breaking. They are easy to install using the supplied hardware. They are designed to be load bearing and have a smooth operation. Nylon Wheel Nylon is a thermoplastic substance with excellent mechanical properties. It is able to withstand heavy load capacities and oc