I thought you would have spied the Kirby-Lauson immediately, grumpy...seeing as you love them so much!

Jimmer, the method of removal is easy; just unscrew that nut as far as it will go...(ie.)towards the engine so that it is loose; grab yourself a three leg gear puller and carefully pull the clutch half off the engine shaft...be careful not to lose the key.
Please let us know how you get on.