Rudder Modification. Another great modification for the Caraboat is a bolt on rudder made by add a rudder, with a little modification to the mounting plate by drilling a hole in the middle of the bracket as it adds more security and use ability without it there was vertical movement from the rudder I also made an additional extension piece about 4" long at the top of the rudder to give a bit more surface area when turning a great modification that transforms the steering to a Caraboat