Thanks for posting. I will watch them when I'm not at work. I've never adjusted my tension on my machine and it works great. It's nice to know the info just incase you ever have to adjust. I don't think I'll ever learn enough about thread and needles though. At the Hampton Quilt show I bought a needle that has 2 holes, not a twin needle but one that has two holes, one above the other. I haven't used it yet due to time constraints but I plan on checking it out.