So it looks like when I was pullijng clecos, I got stuck and pulled some corners out of the rivet holes. So I flattened them back with my duckbill pliers (sheet metal pliers) and filed them smooth. Unfortunately they don't look as nice and sturdy as they should. So, after some calling around, found out this is a nice way to fix it. Build a backing/stiffener/doubler/brace/whatchamacallit. Did it...it looks like it's supposed to be there. ;) Moving on.