I can see I will be using alot of thread in the Mark Making with Machine class! We got off to a good start by familiarizing ourselves about our machines' capacities. I turned the screw on my bobbin case for the first time - something I haven't wanted to alter in case I couldn't get the tension back to functioning properly. Not a big deal at all - and I do have a second one. Many of the machines correct themselves so well that changing the tension doesn't show hardly any noticeable differences. I started samples of my Pfaff's range of tension, stitch width, length and type.