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How to Repair Bifold Door Top Roller Guide If your bifold doors have become stuck, they probably need a little maintenance. You may need to clean, lubricate or adjust them. could be caused by an unfastened bolt on the top pivot, or by the top guide roller. This kit comes with all the hardware needed to return your bi-fold closet door system to optimal performance. Remove the Door It may appear complicated and difficult to install an internal set of bifold doors, but for DIYers with a little exp