Not a very clear pic. I wanted to show the dimples in the rib flanges. The dimples are necessary to allow the flush rivet heads to sit down flush with the top surface of the part, which is effectively dimpled or countersunk to match the dimension of the flush rivet head, which in this case is always 100 degrees. A set o fdimple dyes are used to create the correct sized dimple for the correct sized rivet. The idea is that the rib flanges are dimpled, and the holes in the skins are also dimpled, and the rivet will sit flush on top of both parts.
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