hello-after some kind information from earlier posts, I think that one of my hubs is either not original or the studs were not pressed in straight such that the studs are not centered in the wheel holes and will wear oval holes in the wheel holes. so I have to remove the hubs and have a machine shop set the studs perpendicular,72 dgrees apart, 5" diam. M y questions: 1. is putting the jack under the king pin is best? I don't want to break the cross piece 2 anything I should /know about getting hubs off like is the outer race left threaded- what else? you thank- i'm a beginner