Today was the day I began riveting the horizontal stabilizer, starting with the rear spar and spar bars. It went together quite nicely with the pneumatic squeezer. The rivet call out seems a tiny bit short, but I was able to get them to squeeze to an appropriate size. There was an issue installing the outboard horns (413PP). The plans said that the rivets were a AN4704-5. Well I tried one and it gauged out too big by a small amount, so I tried to squeeze it anyway. Guess what happened….. Yep, it bent over. The proper size would definitely be a AN4704-4.5, but I didn't have any of those, so I had to grind down some 4-5`s to make it work. Check the picture out to see how they look with the 4.5ish. The other horns (412PP) went on without issue. The center bearing went on pretty easily, I torqued the nuts to 23-24 inch pounds per the table from vans. This does not feel like much at all, but I resisted the temptation to use more force, I placed torque seal on the nuts and called it a day.