How awful someone would trash your machine! As a wool spinner, I can tell you there are 2 types of twist: s twist and z twist. For spinning wool, s twist is spun in the same direction. If you make 2 ply yarn, you would take 2 spools of s twist and spin them in the opposite direction as the they were spun the first time, making them a z twist. With yarn you can look closely and tell if they are lying like an S or a Z. All machine thread is spun the same direction, as far as I know. But a friend of mine purchased a new machine only to find it did not like the YLI thread she was using. Once she changed thread, it worked fine. I would suggest trying different threads until you find the one your machine likes best and whatever that thread is, stick with it. Make your machine happy and you will be happy also :) Enjoy your new machine and happy sewing. Lena