I worked on a quilt trying to get balanced tension with two different threads and finally just gave up. I really wanted to figure out how to get the tension right. I did talk to Michael and was told I would always have what I call pokies, dots of color. Even when I could get tension right it would only look good for a couple inches. I did try the Bobbin Central magnetic core bobbin and still didn't get the results I wanted. If you get it figured out please let us know how you did it.