Have been away from the RV project, just as predicted, due to work.
Some of the rivets in the rear spar for the vertical stabilizer are "tipped", and the working theory is that 1/8" rivets are too much for a 4" yoke on the squeezer, so the yoke is flexing. So I installed a smaller yoke, drilled our about 15 rivets, and replaced them. Some of them twice. (That's the "you shouldn't do this on a Friday night" effect.)
The photo below shows one of these rivets. This particular one is waiting for my attention tomorrow. So not done -- more of this drill and replace coming up...
Time: 1 Hour