Tranferring the Cross
Depending on the yarn (if they are smooth yarns, such as pearl cotton, Tencel, rayon), you can put two ends in a dent and just choose whichever one you want when you thread without worrying whether it was truly the next one in the cross. But for some yarns (twisty or sticky) it does matter; they will not want to separate when they get to the heddles. For these yarns, what I usually do is “transfer the cross.” You sley the reed, but leave lease sticks in the cross as you sley. Then, you turn the lease stick closest to the reed on edge and slide another stick in the opening on the other side of the reed. You take the stick out that you had on edge and bring the second stick up to the reed, turn it on edge, and slide another stick inside the opening on the other side of the reed. The lease sticks are now in the cross on the side of the reed where you need them for threading. Then you put the reed in the beater and secure the lease sticks in front of the shafts as you sit behind them to thread.
It’s awkward to do this transfer; you have to hold tension on both ends of the warp to make the openings as you turn the sticks on edge. But it works.