Joe S Duncan , SC February 08, 2019 The re trackting of the vent was irratic very rough like it was getting stuck on it's way down Replaced all three guide rails. It took longer to remove the vent from the island then it did to replace the guide rails. Read More... Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours Tools: Nut Drivers, Screwdrivers, Socket Set