As someone who has done a fair amount of sailing in my youth, I like to think I’m more familiar with knots than the average bear. But there was one that I’d heard of in the past but knew little about: the Alpine Butterfly Knot (or Loop). It looks like this:
and it turns out to be jolly useful, but if you just look at it, it’s very tricky to work out how to tie it quickly.
There are lots of different techniques and lots of different YouTube videos about them, but today I found the method I liked the best: