Here is an interesting You Tube video of a green Singer 319w that was converted to a treadle. It made me put a 319 on my wish list and I did find one on CL but haven't put it into a treadle cabinet, yet.
http://www.youtube.com/watch?v=j7PVL...E82789647888E5
As you'll see in the video, you can treadle even fancy, shmancy stitches