"Wobble stick" centering technique, and T rest height?

[mbwatch]

Hi all - I was just watching Clickspring's series making a custom faceplate and he demonstrates the "wobble stick" technique for centering. I  was already familiar with this and it is all straightforward. But how does one set the height of the T rest so that it acts as a truly level fulcrum? Or does it actually matter if the fulcrum is perfectly level with the hole you're trying to center? As I type this I'm realizing there should not be any motion at the other end of the stick even if it is at an angle relative to the work, and isn't pointing even with the tailstock center. Do I have that right?

 

[caseback]

Yes, the t-rest hight is not critical when using this method.

Edited 11 hours ago by caseback