How to re-align tailstock?

[rasta]

Precision alignment is usually done with an axle bearing two rings, one at each end. Run between centers to avoid chuck errors, etc., a cut is made on each ring and their resultant diameters compared. This is very similar to what you suggest.

Nevertheless, it is tedious. Having a set of alignment buttons to get you close will minimize the time spent with precision alignment and, depending on what the work is, may themselves provide sufficient alignment.

Hi; there is another method , that you can use without turning buttons or machining anything, just put a magnetic stand with a "finger" type indicator in the face of the chuck, make sure that the indicator finger is touching either in the inside hole of the tailstock or the outside diameter of the tailstock quill.Now, rotate the chuch BY HAND, slowly and you will see how much the tailstock is out, just adjust until you have same reading in the indicator across both sides of the tailstock.
Please allow me to say this... MERV KLOTZ you are a GENIUS!
Mariano