Congrats on owning a Two Spools. I do hope your have the spool can, which holds a spool of thread instead of using a bobbin. this is a link to what the spool can looks like:
http://www.quiltingboard.com/vintage...n-t179788.html
If you don't have all the parts to the treadle (I can't tell from your photo there) and you don't feel like working on that cabinet and treadle, you could use a Singer treadle with some alterations to the top to hold the Two spools machine. I had to do that with my first Two Spools since I didn't have a treadle for it. Here is the link to directions and photos of how I converted a Singer treadle to fit a Two Spools.
http://www.quiltingboard.com/vintage...t-t130940.html
I use my Two Spools for piecing since it has the perfect 1/4' foot along with the feed dogs that have the exact same length of teeth that help in feeding the material through at the same time.