How to re-align tailstock?

[NortonDommi]

Hi Rendoman,
Do you have a pair of centers? One for the head stock and one for the tailstock? If you have place a six inch,(150mm), rule between the two with a light pressure. Looking at the rule and how it lies will tell you if alignment is out and in what plane.
Rough set/align and then chuck up a bit of scrap. Center drill the end and turn the outside round for about an inch. Part-off a bit about 1/2" long. file/stone off any pip. place parted off piece back in place where it came from and bring up center in tailstock to hold firm.
Rotate chuck while holding parted off piece staytionary with thumb and forefinger. You will be able to feel any mis-alignment very easily between the two faces,(radial displacement).
Short of having test bars and quality D.T.I.'s this is the easiest method I know. Note most tailstaocks are not true in the verticle plane from the factory.