I then remembered that “on yer bike”, our local bike-fixer-upper charity, was usually open on a Sunday. Headed round there, wandered into the workshop, said “I’m looking for a spoke nipple”. Bob, the mechanic, nodded towards a big tray of “stuff”, and said “have a look..”, and laughed when i said “how much do I owe you?”.
I stuck something in the donations tin, and left happy.