I had to grind a bit on that bolt sticking up from the cable guide, but otherwise the cartridge fit properly and the crank now turns smoothly. No more wiggling! I'm going to go through the wheel bearings before I put it back together. And clean those derailleurs. And whatever else comes to mind.
I have a set of 28mm tires lying around I want to try for comparison to the 35 and 38 that are on there now. I'm planning to run 32s or maybe 35s on this bike, but I'm going to start by testing what I already have in stock.
50 days left until RAGBRAI.