http://www.backwoodshome.com/forum/v...read.php?t=463
At this link there is discussion on how to thread this machine. There are links inside the discussion and they will take you to diagrams from the owner's manual. Most old treadles have the shuttle type bobbin which you will see in the diagrams; how to thread it, etc.
AND, here is a link to a way to the actual manual!!
http://www.thetreadlersvillage.com/S...nVSManual.html