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How to Repair Bifold Door Top Roller Guide If your bifold door is sticking it's likely they need some attention. could require cleaning, lubricated or adjusted. The problem could be caused by a loose bolt on the top pivot or by the top guide roller. This kit contains everything you need to restore your bi-fold wardrobe door system to its optimal performance. Take the door off It may appear complicated and difficult to set up an internal set of bifold doors however for DIYers with