Sorry to hear your rudder issues. When you showed me your Tristar a few years back, you mentioned you trailer it to/from the local lakes. Maybe grease the zerks and wait till spring to see what happens. If it's not fixed, then take it apart when you get it back in your garage? Such a low hour boat that maybe it just dried up over the years.
Was out in Rapid a few weekends ago with the family and was out on Angostura..very nice.