Back riveted rib halves to the elevator skins. I came close to throwing in the towel. The problem I was having was getting good shop heads with my back-set. I kept getting clinched heads because the flange of the rib was interfering with the plastic collar of the set. I had to drill out multiple rivets so I shaved down the collar and got my technique down and was finally able to get it done. I almost boight a longer set as the rear rivet on the larger ribs was a real bear as the retaining spring was hitting the flange. I ended up using my tungsten bucking bar on the rivet and hitting the bar with the set. Took a little longer, but it got the job done. I'm not super satisfied with the overall results, but I think it's OK.
