Skipped ahead a bit while I wait on my spar caps. Finished the last few dimples and put the skins back in the cradles. The inserted and cleco'd the front ribs in place. Everything fit pretty snug and I didn't notice any tendency of the skins to pull away from the ribs that I've read some people having.
Squeezed the rivets for the inboard and out board ribs. Then set up to buck the interior ones. Turned the gun down quite a bit; I think I've been creeping up a little with my settings and had contributed to some of my recent struggles. Down around 30 psi, and turned the needle valve on the gun down a bout half way. Seemed to be plenty enough to set a -3 without the gun bouncing around too much. Didn't do too bad, but I think I will finally break down and by one of the rubber ringed flush sets. Some people swear by them, others say they're not as good. I guess I'll see for myself. I'm not going to make it through this build if I continue to struggle with more than occasional dings in skins.