I found buggered threads when putting a freewheel back on the hub, and it started to cross thread.
After reading several suggestions...thread file, knife blade, buy a new wheel, etc....I took an old bottom
bracket lock ring, cut a small slice out of the perimeter of the lock ring (Hacksaw), and...
When I was young road rider and knew nothing, I bought a used "24" track bike for my son.
It was a Drysdale in very worn grey paint. I sprayed it orange.
I remember trying to drop my son on a training ride, just gradually increasing the pace.
When I looked back he was tucked onto my wheel, and...
Just saw your post.
I have a complete, original, 22 inch '72 Opaque Green Sports Tourer,
It is partially disassembled and needs to be photographed.
It is in extraordinary condition, but if you're patient...