Brief Description: preassemble forward ribs and firewall
Assembled the firewall and forward center rib. A few of the rivets close to the edge required fabrication of a special bucking bar. I used a short piece of 1/2" x 3" hot rolled mild steel for mass. I drilled a hole to fit the #470-4 die, then notched for the flange. Hard to explain, but easy to show in a photo.. I used a back rivet set with the bucking bar. The rivets for the ruder pedal support are another matter. There is no easy way to get at either side. I used the die support/bucking bar thingy in the recess. I cut off an offset rivet set just past the second bend and ground it flat to use as a back set. It still took a partner to get a decent set.