The post mortem revealed, of course, that the flashing had cut the tire and was all wadded into a terrible mess. I guess from riding on the flat for 2 miles getting to WM and a rescue.

Redone now. Wrapped in Gorilla tape and enclosed in old inner tube like the liner in the rear tire. Miles to go. Or not.

Ok. 17 miles later, blown tire. Post reveals galvanized flashing will never work as the constant flexing causes it to break up. Rear, lined with aluminum, still fine. Wonder for how long?