More on the Helsen 20. The centerboard pivot pin is accessed through the seat hatches. The picture shows the cover removed. The interior picture shows the pin glassed over with the bottom of the seat left and the end of the bow flotation chamber at the top. It looks like the pin on my boat has been removed at least once since it came from the factory. I can see the bump from the glassed over pivot pin in your picture. At least the pin will be easier for you to remove if you need to refinish the centerboard.