So apparently nuts are glassed in but as they corrode they have the tendency to spin if you try to screw anything into them (assuming you can get the broken screw shaft out of the nut). To do the job correctly, the boat would need to get hauled and the toerail removed. All those holes would need to be over-drilled, the old nuts removed, and new nuts would get embedded. That is supposed to be the strongest approach. Another option is to pull out as much of the old screw shafts as possible with the toerail in place and then fill the existing holes with epoxy, then drill a pilot hole and use smaller self tapping screws . This would not be as strong but certainly stronger than it is now. One thing that is nice is it seems that the toerail screws are completely in fiberglass so there's no path for water to get in the boat. At present, it does not appear that these small screws have anything to do with the hull/deck joint. Actually, it appears the hull deck joint is glassed on the inside which is surprising. The screws on the side of the hull holding the toerail in place are corroded on the outside but seem solid. So unless we put any large loads on the toerail, it does not appear to be a safety issue at this time.SentWrite to Wayne Busch and Jackie Busch