Just a follow up with the Delrin screw discussion link from Matt....the luggage scale I used to set the tension worked well except I set it to the upper range at 25 lbs which was too much and caused one of my cams to shear instead of kicking the rudder up. I backed off a full turn of the Delrin screw and it has worked well all summer. Wrapping the screw with teflon tape also worked out well. The screw is snug (after tapping out the rudder casting) but still turns easily. And I doubt the screw,lined with teflon, will ever freeze up again.