If you offset the tailstock on a regular basis I would suggest investing in a test bar. I was offsetting the tailstock on my Sheldon several times a week. It got to be a pain to realign it every other day so I invested in a test bar like this:
http://www.penntoolco.com/edge-tailstock-alignment-bar/
If it's a one time adjustment I would also turn between centers. Make sure you true the center in the headstock before taking any cuts on your stock