half inch, I think
Hey Marcial,Yeah, I just swam up under mine last month because I realized that I had forgotton to tighten those things down when I had it out for a bottom job. I'm assuming you're talking about the two bolts on each side of the keel towards the bow. I'd almost swear that they are 1/2 inch. Don't mess around with those metric sockets. You may have to jam the socket on there good if it's been painted over. When people talk about how tight your keel is, I think they mean how much it wobbles. If you can lower it and have it free, see if you can make it wobble realtive to the bottom of the boat. If it wobbles too much, you've gotta take the whole thing off and replace that bushing. If you do that, I 'd spenf the extra fifty bucks, take it to a machine shop, and get somebody to drill you out one about three times the size of the origional. That's what the previous owner of my boat did and that keel is rock solid now. Best of luck.Billy