Agree with the above! When needing a real accurate final result:
1 center as above
2 super glue a piece of 1/2" or thicker plastic over the hole in the rotary.
3 machine a round stud from the plastic by using the rotary motion of the table.
4 use a good indicator on a bent angle of rod ( or indicol) in the collet to center the spindle above the stud.
5 remove slack in the feed wheels and you are there.
To know by reading is different than knowing by doing. OR:
What you have going into a situation is knowlege..What you have coming out of that situation (providing you survive!) is wisdom.