In my case coaxial was not the issue since the probe rod was not actually coaxial to the main body. So I was jiggered all ways to Christmas!! - I think the coaxial route might require two levels of four screws if you wanted to keep the parts square? Difficult to adjust I imagine, even if the shaft flange was assumed to remain flat on top of the body, with one ring of screws. Interesting, even though I have already committed to the tilt.