A chain of events
I used to think that chain repairs were easy; all I needed to carry was a chain tool to extract the odd pin, and a 'quick link' to join the ends together.
A few days ago step-daughter Charlotte 'phoned. "I'm half way round Bleasdale and the chain has broken .... " so into the car for a rescue mission.
What I discovered later was that as well as being broken, it was also badly twisted. A simple join would achieve nothing.
So now, when touring, it has to be a chain tool, and a couple of 'quick links' and a small length of chain.