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Hello Mark. My name is Tan.
Have you disconnected the steering from the rudder and tried moving the rudder by hand? Does it move freely?
Then the rudder shaft is bent or it is binding up in the shaft packing . Loosen the packing nut now see if it turns freely. If still stiff the rubber will have to be removed and inspected for a bent shaft.
Were you able to disconnect the steering from the rudder?