No official optional CR123 tube yet. If use with the MK.II CR123 tube, must put spacer or spring at the bottom, but still not stable and not easy to operate.
If solder a small spring at the MK.II X head pcb (like MK.II), maybe it'll be easier to use with the MK.II CR123 tube. I don't want to try it, so I sell my tube. :laughing: