The Landis Gs were fairly easy to identify and research, I had a general idea what they were. The Auto-Solers I must confess, confuse me. They have giant spools of very stiff wire, I can't imagine sewing on a sole with that, are they to attach heels or something? I also have been unable to pin down exactly which models the red Champion, and the little American machines are. I would love to know what models they all are, so I can buy books, and decide which I am going to keep. Ideas?