When to change the shed
When to change the shed is immensely important. Change the shed immediately after the beater has hit the fell of the cloth with the beater still against it. The fell locks in the weft as wide as the warp is in the reed—preventing the narrowing in of the cloth. If the cloth becomes too narrow, the outside warp threads will begin to break.
To change the sheds efficiently, try to tie up the treadles so you can “walk the treadles.” That means you alternate your feet as you make the sheds—left, right, left, right, etc. This will be the case if you chose the configuration in the photo. (To make plain weave (tabby) you will press down both left treadles at once with your left foot. Do the same with your right foot for the next shed.) Visualize how much fun it will be to treadle a twill: 1&2, 2&3, 3&4, 4&1.
If your treadles are in numerical order you can still “walk” them. To lift shafts 1 & 3, first put one foot on the treadle for shaft 1 and then, put your opposite foot on the treadle for shaft 3—you will be using both feet and two treadles, but you’ll be putting your left and right foot on the treadles one at a time. (It is not good for your back to move both feet at once.) For the next shed, put your first foot on the treadle for shaft 2 and then, your opposite foot on the treadle for shaft 4. Now, begin the process again by throwing the shuttle.
Keep track of which shed to use
Enter your shuttle on the side of the warp where your treadle is down for a particular shed. In other words, if your shuttle is on the right, then you’ll know that the shed to open is the one using the right foot. The photo shows an example of this arrangement with the shuttle being on the right side of the warp and the right treadle being pressed.