I finished up the section 14 work by torquing the rib bolts to the specified value recommended by VAF.forums, and then used torque seal paint to make inspections easier in the future. I also installed a larger rubber grommet into one of the holes of the innermost rib because the intended plastic snap bushing was a little too loose (likely from my poor step-drilling technique of that first rib).
Then I started the first step of section 15 by prepping the aileron hinge brackets. This involved flattening out some of the bend, deburring the holes and edges, scuffing, priming, final drilling, and countersinking some of the rivet holes. Then I got to use my hydraulic press again to press-fit in a bearing, and then hand squeeze some rivets into these multi-piece brackets. One of the brackets is the revised version that is a part of a service bulletin, that was in response to some cracking in this area, so it is obviously much beefier as a result.
Unfortunately, I only realized only after riveting that one of the COM-3-5 bearings in one of these brackets seems to be rotating and pivoting with a lot more friction than the other ones. I'm considering drilling apart that bracket and replacing the bearing with one of the remaining ones and ordering a replacement. I also happened to notice that tail lengths of 3 of the rivets in this bracket were just slightly on the short side, so ordering longer ones might be a good idea anyways.
What's next? The next step for the rear spar section is to begin preparing some doublers for the rear spar itself.