I am not a mechanical guy - That is why we use a wheel specialty place. They store our summer or winter tires while we are using the other set and then we take each vehicle in and change them over when we need the other set. Saves me having to store the set I'm not using. I have used this place for years and have never had an issue. Needless to say, I will be having a pretty stern conversation with them on Monday morning. The damage to the vehicle will, I am sure, be several thousand dollars. If I don't get satisfaction from them, then I will sick one of my litigation partners on them. One card I do have in my favour is I can litigate for free whereas they, I suspect, can't.