Creealock 37 rudder
What is the piece that seems to be bolted to the bottom of the rudder. It almost looks like it is made out of zinc. It has bolts going thru it. What's it's purpose, what's it made of. I saw one Crealock 37 with a zinc attaced t one side of it. On my crealock the remnants of what appears to be 2 zincs are hanging off of it.