I made a similar 2axis for an earlier project but that one looked ugly so i gave it a second try today with some stuff i had laying around in the boat…
1.I drilled a hole in my current pole used as rover
2.Fittet the rowling with bolt to the pole
3.Chopped the end of the broom (which was a mistake as i had to see inside it, i have no idea why when i think about it . I had to fit a bolt in both ends so the inner pipe wouldnt slip off the outer casing) This is a flexible shaft rotating around its own axis and the rowling provides the second axis.
4.Thats it. I fixed it to a C-clamp on a tripod i used for potographing just to show you the gravity doing its job.
Tested it with a vertical laser and it did well. Gravity is awesome.
With a longer pole for the rowling shaft, you could use a bipod to support and have the rover hanging over ther point you need to survey.
I problably need to fit a new holder for the rowling as it has been chopped of and i need better solution for this,
Enjoy. And i hope this give you an idea for your own gear.
Here is link to video
A special thanks to the leftovers, may it rest in peace or used by a small person.