From there I moved on to a seriously underestimated repair. Never mind the details. It reminded me to post a note about adjuster tuning cheap caliper brakes.
Adjuster tuning is a lazy shortcut used by sloppy or inexperienced mechanics. They turn out the barrel adjusters on derailleurs and brakes rather than taking up slack at the anchor bolt. But on cheap bikes with wide tires (and expensive bikes with embarrassingly inadequate quick releases) adjuster tuning allows you to get the wheel out or in without deflating the tire.