Beautiful race day on Lake Hartwell is upstate SC when rudder on my 1983 S2 6.7 suddenly became unresponsive. It appeared to be intact and in position so I assumed that problem had to be with retractable keel. Again all appeared to be in order so I cranked it up a couple of turns. This seemed to resolve the control problem but it worries me that something deeper might be involved. Recent bottom job done on lift with no apparent problem reported. Any thoughts, experience or ideas appreciated. Harry