Looks like the very front segment " might"screw off. This would make the ~72mm.
Have they changed the cursed auto-guide plug on the camera rear? It was the one thing that drove me to ASCOM and pulse-guiding. I haven't used my lead for years, just use the USB lead.
Gary
My "Mk1" if that's what it's called uses a mini USB as well, for the info in/out. But it has a stupid flat 6-8 pin connector for the mount, the other end being an RJ11/12. For a while I simply plugged them both in, and tie-wrapped the cables to the Lodestar, as any plugging/unplugging eventually lead to the lead/plug failing. Hopeless.
Now I just use the USB only, and pulse-guide.
Gary