Logan, before I started to turn between centers, I used the mandrel saver from PSI. The first one was a piece of crap but they replaced it, no charge. This places all the pressure on the bushings/blanks and not on the rod. This gives you less chance to bow the rod causing a more pronounced out of round problem. if you are using a mandrel, I would recommend the mandrel saver.
Charles
PS: I was posting while Ed was also. Whenever Ed offers advice, I would pay very close attention to it. You might also want to check out u-tube for some of his videos or his site at Exotic blanks. OOPS, I almost forgot to welcome you to the IAP. Be sure to check out the library, lots of great info and tutorials.