Watch: Fast and Loose
"It paddled great, it was loose, it was fast, it was everything I couldn’t get from a single fin on a three foot wave," recalls Mark Richards of the first twin fin he ever shaped - dubbed the 'bumblebee twin' for the bee picture on the deck.
The bumblebee twin and the boards MR shaped immediately after it, altered the path of surfboard design with MR winning a then-record four straight world titles on them.
But then 1981 rolled around, Simon unveiled the Thruster, won Bells, the Coke, and Pipe on it, and suddenly no-one wanted twins anymore.
Fast forward 25 years and MR again starts making twins because the qualities that made them popular in the first place - they're fast and loose - make surfing so much more fun.