Ok Cathy says she has done it
http://www.quiltingboard.com/vintage...ml#post5183404 she shows the bobbin winder and info how to make the machines with potted motors treadle. I wonder if you can hang an external motor on them or hand crank - I have to look at the motor boss to see. I'm excited though - I have a bunch that have bad wiring. BUT there is a man named Rain who has a wonderful blog with a tutorial on rewiring them.
http://vssmb.blogspot.com/