How did you treadle it? Turned Twill is all about alternating Blocks A & B in your treadling. At this point, a good thing to do would be to watch Season 6 with Jane's introductory episode to Units, Blocks and Profiles. Jane explains in detail in this episode and we learn how they all work. The next episode is all about 8 Shaft Turned Twill, which will give you a deeper understanding of using your blocks.