Sometimes things just work out. The replacement screws for the counterweight arrived, so I went to re-install the counterweight in the rudder tip. Realized that it was originally installed in the incorrect place, and I would have had to take the rudder apart to correct the issue. Whew!
So a hint to other builders: double-check the counterweight location against the plans one last time before you cover it up!
Also riveted most, but not all, of the tip rib on. That rib covers the counterweight, so this was a major catch. Still a few rivets to install, including the pain-in-the-ass ones near the trailing edge.
Total time tonight: 1.5 hours