https://picasaweb.google.com/wmhatfield/BrakesBearings#5529976960122832162

Here's a shot of the nut you seek... I forwent the axle nut in favor of a punch and lightly tapped all around - The nuts should come off pretty easy with all that axle grease!

I wish I had taken my rear bearing off when I did this... I spent hours banging at the drum with a sledge until I got it off. My cylinders were completely rusted and seized open.

Oh well - you live, you learn!