Actually be careful with the whole "they should have some play" theory. Like i dummy i went with timkin a while back thinking they were still made in the us. They were not. Pressed them in, put them on the car torqued them down and grabbed the tire at 12/6. it had about 3/4" of play. Went over everything i did it was pressed in correctly. Removed the hub put it on the arbor press and put the full force of it down on the bearing as it should either blow it out or lock it up tight. neither happened, it was still flopping around horribly. Finally pulled the 2 out i did, took them back got replacements, refunds were no go, and since i was not going to do that again i took the timkins i got and decided to try something out with the new ones. I had a shaft i could put in the bearing while i pressed it in. again back to the press, pressed along the outer race when goning in the hub, pressed on the inner race when going into the outer hub. the new ones were just as bad, and i will never buy timkins again. pressed them out when i got the fag's, pressed the fags in and have not had any trouble since.
cliffs: sometimes you do get bad bearings and they flop around after being pressed in.