It became apparent that the rudder tube had not been well strengthened. There was no strengthening aft of the tube or to the sides. There was also already a crack in the weld aft of the rudder tube.
Our solution was to install 20mm plates diagonally back to the L-section frame just aft of the rudder tube. When the hull plate was back in place there was also a 10mm "stress plate" welded externally around the rudder tube extending about 100mm all around.
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