I have refurbished/rebuilt a fair number of Star and Phelps reloaders, and the part I most often replace is the rocker arm screw. The rocker arm screw on many machines has a tendency to back out with use. It only has about 1/4" of thread, and if it backs out enough, the rocker rides on the thread, and can bend the end of the screw. When that happens, you can't get it back in, and you will have a heck of a time getting it out. If you see your rocker arm screw protruding even a little from the steel base, screw it back in. I you do that, it will last forever, they don't wear out. Very few Stars have died of old age, it's usually neglect that does them in.
When you look at those Star listings on eBay, take note of the rocker arm screw. If it's sticking out, there is a good chance it will have to be replaced.