Dunno if you'd call it 'the plot', but due to pressure from the landlord I had to do stuff on mooring on Sat.
So
After due consideration I agreed with his assessment that mooring pole needed resiting. Unfortunately that meant digging it out (it was only half-dug in due to flood washing out bank). Dug new hole for it to go in three feet further up bank. Dug down next to pole/concrete.
This is a 6" square steel pole, which I thought was only 6' long, 3' in concrete, 3' sticking up. I was wrong. It was 9' long. So I dug, and dug and dug. Then I dug out my new home for it some more.
Got farm jack out (I love that farm jack) and started jacking up pole - the pole is attached to a 7meter steel beam. This is all attached to a steel pontoon and a 20ton barge. Oh, and I rigged a rope to another pole on the bank and winched that tight, so the whole lot wouldn't fall over when I jacked it up. This didn't go quite as smoothly as I'm making it sound, the jack slipped off a few times, jammed on it's linkages a few times and there were a few fboab words said. There was the stage when all of it was swinging in the air and I had to scrabble in the hole and scratch a bit more soil away.
But finally it dropped into place. Job's a good-un.
I did have offer of help from someone else who had a boat on adjacent pontoon, but I'd only just met them and this sort of stuff is very prone to going wrong - make a mistake and people get very hurt. I don't want to be responsible for someone losing teeth (common accident with farm jacks slipping or handle kicking back) or getting crushed by hundreds of kilos of steel falling on them.