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DIY Bifold Door Roller Replacement The bifold roller is the most frequent 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 designed to be load bearing and operate with ease. Nylon Wheel Nylon is a Thermoplastic material that has excellent mechanical properties. It can withstand large capacities for load and