On a more successful front, I repaired the rear tire on my resuscitated 10 speed road bike. I had pumped up the tire to the recommended high psi, something over 60 psi, probably, and took her out for a spin. After about a half mile, I got 2 bulges from the rear tire, and a thumping, once per revolution. Took her back to the barn for a look see. The tire had come off the rim somewhat in 2 spots. No leak. Tube inside was intact. I deflated the tire, pushed the edges of the tire back into the rim, and reinflated incrementally over the next 2 days, making sure the tire stayed inside the rim, and got get the psi back up to 42. The tire was just slightly bulging at 42 psi. Took her out for a 3 mile ride, and she's doing fine. I plan on leaving the psi at 42, which is really low, according to the internet experts, but it's better than that awful bulge. Smooth ride, too. And unlimited non-boring exercise.