What type and size rivet should I use to reattach the stringers. Starcraft originally put in two rivets per rib, I plan on doing the same. I have 3/16x 1/2 rivets with steel shanks. I don't know about the steel shanks because of corrosion issues. When I took the stringers out there was only one river holding it in, I really don't want that to happen again! Is there a beefyer way to fasten these?