Intro to a port job
Mine is the old square drive, grinder/driver. And them grinders are heavy!!!!
Vary easy to let the grinder hang a little. Cauesing the square drive to put a in even load on stem/driver. By floating it. By rolling it a round(best I can describe)you can tell when you are putting it on a bind. Once I learned this, seats be come way better. Star drive grinder are way easier to us.