[quote=Dogboy]The ones in your first picture are the newer version. They are stronger due to better lateral support. The earlier version in the bottom picture had a tendency to snap off. Since that looks like a Hobie 18 transom, I would change them out to the stronger ones due to the higher rudder loads. I also highly recommend using stainless steel rudder pins on the 18. Aluminum have a tendency to snap under load.
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