Some damage from dropped centerboards is common, though yours sounds worse than most. The repair will depend on the extent of the damage, which is hard to judge without a photo. Relatively minor damage can be repaired with nothing more than thickened epoxy resin. For damage that is a little worse, you should mix in some chopped up fiberglass cloth. For more serious damage, you will want to build the damaged area back up using layers of fiberglass cloth wet out with epoxy resin. Pay particular attention to the condition of the seam where the centerboard trunk is bonded to the keel. If that seam opens up, water might migrate into the steel punchings that were used for ballast, which can cause a number of other problems. ----- Original Message ----- From: "Gary Froeschner" <gfroesch@socket.net> To: "For and about Montgomery Sailboats" <montgomery_boats@mailman.xmission.com> Sent: Monday, July 11, 2016 12:45:09 AM Subject: M_Boats: M17 busted keel I bought a 1976 M17 about 3 years ago with a broken keel. The center board retainer pin broke out the bottom of the keel like the center board was dropped hard against it. The pin is missing. It broke through both sides of the keel. I am finally getting ready to do this repair and looking for some guidance. Has anyone done this repair? Is this a common mishap?