This time I worked on driving all of the rivets that hold the ribs to the main spar. I initially tried using the same technique as I used for the left wing, which was to rest the main spar flat with the ribs pointing up, and also using a double-offset rivet set. This again ended up being quite challenging to reliably drive good rivets, so I tried setting the spar on its edge and also just using a straight rivet set while bending the ribs slightly to allow the rivet gun straight access. This method ended up being quite successful. I did have to de-rivet the torque tube assembly from the inner-most rib since it was in the way for my rivet gun to reach. I remember that I had this problem with the left wing too, but forgot to delay attaching it until after the rib was riveted to the spar, which is something the instructions should really be updated to change the sequence of. In any case, after the inner-most rib was riveted to the spar, I then squeezed most of the rivets of the torque tube assembly back on, and used the rivet gun for a couple that I couldn't easily reach with the squeezer. With that big task done, I pulled out the rear spar from storage and clecoed it in place just to stabilize the ribs What's next? I still need to do a final torque of the nuts, and safety wire the pushrod bracket. Then I'll start working on the rear spar preperation.