Client couldn’t shut the gate as it was sagging, so the dogs kept getting out. We can’t have that!
It was a long gate with no diagonals in it, causing it to droop. A situation not helped by the the fact that the concrete holding the post was moving in it’s hole. Client didn’t want to go to the trouble (& expense) of correcting a catalogue of little problems, so we went for making it work and added a wheel to the droopy end.