After finding the broken weld and researching the best way to proceed, we took the plung (literally). Bill used a socket wrench to loosen the bolts and nuts on the hinges. This took some effort since one hinge under water.
First Bill tackled the 1/2”-5” stainless steel hex bolt, 2 nuts, and end nut that were underneath the water. Once he had handed the bolt and nuts to me, he disconnected the steering strut from the rudder cage. Finally, he took off the top hinge bolt and nuts and the shock cord.
Voila! The rudder cage is off and now it can be carried to a local machine shop to be fixed.