I did get the single plyed.  I only spun one spool and so I wound it off with a ball winder and plyed it from the ball using the outside strand and the inside strand.  Sometimes when you do that they get tangled, but this one plied without any problems.

I found that when I use the double treadle I either have to slow down or tighten the tension so it is pulled in faster.  I prefer the slowing down (but sometimes I forget to do that  and the strands overtwist) because when it pulls it in faster I always feel like I don’t have as much control over the twist.  I wasn’t as pleased with this skein but it’s ok.  It will probably sit for a while since it was an experiment while I decide what I want to do with red and green yarn ;p.  Now I will take a day or two to decide what my next fiber to spin is. 🙂