Have been lurkingfor a while absorbing all the good info on here. I currently use a Lyman 450 for sizing, and that has made me hate the sizing part of this hobby. So, I am looking to upgrade to a Star. I found a couple used sizers on gunbroker and was wondering if the parts from the new ones are compatible with the old. Like if I wanted to add the air, or bullet feed later. Also the new ones are $250 and the used ones are going for $170 +. I'm just wondering if I should spring for a factory fresh one.