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DIY Bifold Door Roller Replacement The bifold roller is the most common failure point in internal folding doors. The problem is easily fixable by using an easy DIY solution. The rollers are constructed of stainless steel and are impervious to breakage. They are simple to install using the supplied hardware. They are also load bearing and are designed to run smoothly. Nylon Wheel Nylon is a thermoplastic substance with excellent mechanical properties. It can withstand large load capacities and occasional