Sorry forgot to mention the remedy. We had exactly the same problem, water was coming from the middle of the rudder, looked like a blister. The groove around the fittings was filled with something that turned into a spongy stuff, which was very easy to remove and then we filled the groove again with thickened epoxy. (the picture is Monsun)
Petr & Jana
s/y Janna, HR 31 Monsun
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