zlacker

I learned this knot in 1986 from my brother, and he knew it for awhile before that, and unlikely through Ian.

I do it slightly differently, and a decent amount faster. I don't pinch and grab after the spin, but rather hook the opposite lace during the spin with the front crease in my index finger.

It takes about 10 minutes to learn, and 20 minutes of practice for the muscle memory to get it right.