Because the rudder swings down and into a slot in the hull when the rudder is lifted, the pivot was a counter sunk flat head. A flat head makes a nice wedge, and sure enough, most of the tillers developed splits.
Not a lot of room for thick side plates when the rudder is lifted.
The solution (after cleaning up, repairing with epoxy, and re-varnishing) was to add 1/8-inch thick side plates, counter sink the bolt on one end, and grind it smooth on the other. No play. No splitting.
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