Had to remove door to move out of kitchen for flooring replacement. Line cracked at base of fridge door and needs replacement. Have bought the parts and taken apart the door dispenser where I've removed the tubing from the bracet. Just not comfortable how best to move the line through the door into the base of the door. There is a access port inside the freezer door below the water dispenser area but don't want to mess with anything I don't have to. General rule I follow is what isn't broke don't mess with. Can someone provide me pictures and instructions to replacing the tubing? There is a circular piece in the tubing I bought that I suspect is to keep the line from freezing. Where does that go? Thanks for any insights you can provide.