Concentrating on the aft spar tonight, and how to best prop things up to help in squeezing the rivets. Finally found a piece of 2x4 to aid in the operation. Slightly unstable but worked all the same.
Holding the pneumatic squeezer is very akward, and finally had to give up for the night when my thumb started to cramp up. Need to work with hand tools more and stop pushing a desk.
