Thank you Woody and Don for the responses. Well Firestone already admitted it on their customer invoice and I have the service advisor's name. I'm calling it a "stud" because their invoice says "reimbursement for wheel stud broken while in service". The car shakes a little when I'm hitting around 65 miles an hour and I was thinking I need to have the tires aligned, but maybe they screwed up the other bolts and I have a loose tire for all I know. I can go by a mechanic's shop and see what they have to say about it and then contact the Firestone. Thanks!