Definitely not perfection, but solid. In review, the MK-319 rivets are the easy choice instead of doing solid rivets on the aft spar with the long bucking bar. I did a pretty good job on getting a good shop head on all of the rivets, but in that you are bending the skin upward slightly to reach in with the bucking bar, it's easy to make small marks in the skin next to the rivet on the aft side of the spar, and I made a few of them, but nothing that can't be cured in the paint shop.