Ken,
Sorry for the late reply. Somehow I missed your post.
I'm afraid I really don't know much about this machine. I seem to recall eaglemike saying that he modified it to use RCBS shell holders, but this was not one of eaglemike's machines. Eaglemike worked at Star in the mid-70's and again in the mid-80's so it's possible he may have done the modification even if it wasn't his personal machine.