Hmmm. You might have something there. Boat was delivered today ( it was a freebie) and shoal keel is resting on center trailer board so i cant see it until i lift boat up. I also couldnt find any big obvious pivot bolt inside cabin which would support your idea. I should of posted more pics. Someone has to recognize it. Hin ends in 77 so suspect it build yearDo you have a true ballast swing keel, or is it just a centerboard? That setup wouldn't be unusual for a centerboard, and a 16' boat wouldn't necessarily need a true swing keel. The cam cleat kinda' suggests there wouldn't be a winch in that rigging (at least to me).