The traveler that Catalina installs is a solid bar with the ends drilled and threaded on the inside with a bolt at each end. Go to the Catalina Direct website and look them up and you will see what I mean. They have them for sale there as parts or complete kits. There is no access that I know of to remove it or install one except by cutting a hole on the inside of the transom. Catalina Direct also sells stainless louvered plates to cover up these holes. You may gain access between the outer transom and cockpit liner from below and use a socket with a long extension if there is room and access to do that. If you don't have a traveler yet and are looking to add one there are sometimes used ones for sale on e-bay also.