To understand the problem, you have to have an idea about how most rudders are constructed. There is a (usually) stainless steel
shaft, and (usually) welded to the shaft is a web of metal bars. The rudder is built in two halves, filled with foam, and then assembled around the shaft and web.
What kills rudders is water
intrusion. Stagnant, oxygen free, saltwater soaking around the shaft and web corrodes the welds attaching the web to the shaft. This environment
also promotes cracking of the stainless steel
. When the web breaks or detaches from the shaft, the shaft is free to spin inside the rudder, and steering
I think it is fair to say the inside of your rudder is soaking in salt water
The CORRECT fix is to remove the rudder, cut the two halves apart, remove the water
saturated foam inside, CAREFULLY inspect the stainless steel parts
, and rebuild
it. Anything less is a botch job and, eventually, corrosion
will win and the rudder will fail.
Depending on local yard rates, it might be easier, and cheaper to have Lagoon
make you a new rudder, if they can still do that.