I want to build a full case 1/2 VW engine and use a Slick 2220 magneto mounted to the back of the engine. Like Les Homan has on his plane. I need help understanding how the mag is driven. I just can't picture it in my head. If anyone has any pics they would share of how the connection is made from the back end of the crankshaft to the mag, I would be greatly appreciative.