(where O is a raised shaft and X is a lowered shaft)
At one point I was so flustered that I tried to find a diagram online for a countermarch tie-up. The information available is remarkably scare. I will definitely be making a video about this subject before too long. Geez! I am sure there are weavers out there who warp their looms as infrequently as I do (after all, how often do you do a tie-up for your tapestry loom? Only when you take it apart to move it!) and I imagine them all madly googling "countermarch tie-up" and finding nothing much useful.
I went to high school in an age where I did my research in the library with a card catalog and index cards. I copied down information from the books BY HAND. When I was in college I think the card catalog was on computer, but I still was using books (you know, those wads of paper bound together on one edge) for the actual research. By the time I got to graduate school I had a computer into which I typed the information I was copying from, you guessed it, books. But now, I expect to be able to find information like how to tie up a countermarch loom in plain weave (for goodness sake!) on my smart phone in about 5 seconds. The information wasn't there. There was an excellent article by Madelyn van der Hoogt, but it was super hard to read on the tiny screen and the photos were for a different sort of loom than mine and my brain was tired. (The article was from Weaver's magazine, Issue 26 which I believe was printed in 1994.) In the end I dug out Rachel Brown's The Weaving, Spinning, and Dyeing Book. She had a draft for twill for a countermarch loom in there and from that I realized what I had to do. Problem solved. Thanks so much Rachel. You always come through for me.
I am pretty glad to be done with this part of the warping especially. I am 5' 10" tall and when I have to climb inside the loom I do understand the greatness of Cranbrook's extended back space. That sectional back beam isn't a very comfortable back rest.