Mario,
I have some on hand that I'll take a look at. I got a three pack and the small stuff is really thin! I think it is going to have too much memory and try to stay curved when it comes off the drums.
Problem with the clam operation is it is easy and pretty much a given that there is going to be slack line on one of the two main drums some of the time. This causes a lot of issues where the line comes off the tip pulley or the drum. I may add a few more guides like on the calming line pulley. And, I tried my second line, thin nylon, but it is too stiff. The embroidery thread actually worked better because it was very soft and flexible.
Still searching...
Jim