It's a Black Tusk one (Hitec HS-77B servo) and a hollow Machinecraft stalk, but it's attaching the servo to the stalk. Done various sorts of configurations trying to stick them together and nothing's worked. This might work, but I'm not sure on some of the terminology here and I can't get the shaft in the UK.
So I guess it's get a shaft, get grub screws (?), drill up rangefinder hole and shaft and insert grub screw, and hope it fits the servo?
Edit: They want 55 DOLLARS to send a 5 dollar shaft to the UK! Are they hand-delivering it? Scratch that method. I'll just stick a nut and bolt on it and have it static.