Let me pass this along also...When you put a steel screw into an aluminum boat you will eventually have issues with electrolysis. Dissimilar metals touching create this and it's sped up quick in salt water...The screws will break when trying to remove them, if you haven't cracked the rib. Get the right type of rivet and a pneumatic rivet gun....also if you do need to remove the rivet, don't drill it out, just grind the head off it will make things a lot easier.
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