We assembled the complete horizontal stabilizer frame and skins one last time to make sure all the parts were in the right place.
We started with the (rear) main spar assembly (SNX-T3-01). The inner rivets are fine, but the outer ones are closer to the flange so you cannot get the rivet gun in there without deflecting the flange
Dan had previously made some spacers to put between the rivet head and the rivet gun. We decided to make a new spacer with a smaller bore to fit the rivet stem better. We had some 3/8 rod and we cut off a piece and drilled a hole. The first two attempts had the hole off center and it looked really bad. The next one was too tall and the gun could not grip the stem. The fourth one finally worked.
It’s amazing how much time these little side exercises take up. We finished riveting the main spar.
We started on the front spar (SNZ-T03-05).
However we decided t rivet SNX-T04-01 (the inner ribs) to SNX-T03-05, forward root clip. The plans show to rivet this later with assembling the whole frame, but it looks more cramped and awkward to get a rivet puller in there.
On the front spar we were careful of the orientation of the inner most rivets, the first rows (on each side) are flipped from the rest.