I have a 2000 GMC full size 1/2 ton 2 wheel drive pick-up. The front wheel bearing has play in it. There is no outboard dust shield or castle nut for end play adjustment. I removed the bearing assembly from the spindle, a dust shield is on the back.Can't figure out if the bearing is servicable. Looks like what holds the bearing in place is rolled/formed so it can't be removed. Any clues? Thanks. Cary.