1. Form a base ring with an even number of beads. Pick up two beads, and sew through the next bead in the previous round (Figure, a–b). Sew up through the next bead, and repeat around the ring to complete the round (b–c).
2. Step up to start the next round: Sew up through two beads — the bead from the previous round and the first bead added in the new round (c–d). Work one round of straight herringbone (d–e).
3. To create a twist in the tube, pick up two beads, sew down through one bead in the next stack and up through two beads in the following stack (e–f). Repeat around the ring, adding two beads per stitch. Step up to the next round through three beads (f–g). Snug up the beads to form a tube. The twist will begin to appear after the sixth round. Continue until your rope is the desired length.
To create a twist in the other direction, work the first two rounds as described. Pick up two beads, sew down through two beads in the next stack and up through one bead in the following stack. Repeat around the ring, adding two beads per stitch. Step up to the next round through two beads.