I finished dimpling all of the rudder frame components tonight. It was a straightforward process, except for a couple of spots on the spar where the shop head interfered with the squeezer. If I had oriented the rivets so that the manufactured head was on the forward side, it wouldn’t have been an issue. At the time I set these rivets, I was thinking about putting the manufactured head on the side with the thickest material, but in hindsight I would have set these the other way around, since the shop head is a fraction of on inch too high to get the dimple dies to sit square to the hole. Not a big deal, I was able to use a hand tool to get a reasonable dimple on them.
Great progress Neal. Busy little airport nearby with lots of people learning to fly even an RV