I always like to think I hit something....even if I did not. From the repairs I've done a few holes big enough to put two hands in work well or space the holes one for each hand.
Big job repair work is harder then building a new boat just less work.
Mike Shappell www.themanshed.com TMS-20 Builder G-Cat 5.7 - Current Boat NACRA 5.2 - early 70's