3/5/2016 – 1.8 hours The last riveting session for the trim tab spar and lower skin was a complete train-wreck (I have since ordered a new trim tab spar and lower skin), but it was time to shake that one off and start riveting the elevator skeleton. I riveted the small gusset to the left elevator root rib with good results from the pneumatic squeezer. Since the squuezer was set up for the universal head AN470AD4-4 rivets, I moved on to the universal head rivets that join the inboard and outboard tip ribs. I used the longeron yoke to reach around the two opposing flanges of the ribs. The longeron yoke worked perfectly, but I had to remove one of the rivet sets to get enough clearance to insert the piece in the mouth of the yoke. Once the part was in, I replaced the rivet set and had enough clearance to insert and set the rivets all the way around. After setting the universal head rivets, I switched the squeezer set for the last two flush rivets. I had to remove the rivet set when I was finished to get the assembled part out of the mouth of the yoke. [Pneumatic Squeezer with 2 1/2" Longeron Yoke, 1/8” Universal Head Rivet Squeezer Set, 1/4" and 1/8” Flat Squeezer Sets] 3/6/2021 – 3.3 hours Riveting the spar assembly continue with the hinge reinforcement plates and nutplates on the left and right spars. The pneumatic squeezer with the 2 1/2" longeron yoke worked well in this area. I kept the same setup on the squeezer to attach the root ribs to each spar as well. I went a little out of sequence with the tip ribs, which I think made things easier and better in the end. Rather than attaching the ribs, and then riveting the tip rib skins in place with the ribs attached to the spar, I attached the skins first and then riveted the entire assembly to the spar. The tip rib skins have 50 flush rivets each, and those are much easier to work with and set with the squeezer and standard 3” yoke in a bench vise vs trying to maneuver the ribs with the spar attached. The spar then slips between the elevator tip skin and inboard rib and is attached with 4 universal head rivets. The rivets through the spar are a little tough to get to, but they would be without the skins on as well. The double-offset universal head rivet set worked well to get into those spots. [Pneumatic Squeezer, 2 1/2" Longeron Yoke, 3” standard yoke, 1/8” Universal Head Rivet Squeezer Set, 1/4" and 1/8” Flat Squeezer Sets, 3x Rivet Gun, 1/8” Cupped Straight Rivet Set, 1/8” Cupped Double Offset Rivet Set, Tungsten Bucking Bars]