Hi to all, I am still trying to get comfortable with my old 4-harness countermarch loom and learning how to read a draft. For my first practice piece, I have arranged the warp threads for plain weave (4321,4321, etc.) and tied it up so that treadle #1 raises shafts 1 & 3, #2 raises shaft 2 & 4, #3 raises shafts 1 & 2, and #4 raises shafts 3 & 4. Question: Looking at a draft for 4 harnesses, can I assume the black filled in squares in the tie up box mean those shafts are raised? If so, can I interpret a given treadling order to correspond to my tie up? Or must I change the tie-up to match the draft exactly? Also, can one change the tie-up in the middle of a piece? If so, how would I tie up for a twill? ... Any feedback is welcome. Thanks for your patience!