Every screw tightened and replace if necessary. this noticably stiffened the hull quite a bit. wood srews are used through the hull into the ribs and machine screws with nuts are used plank to plank. had to do this by hand due to the fact that the drill would either snap the screw or not tighten it enough. thats alot of screws.
all the holes where cleaned out and filled with epoxy filler and sanded smooth