Well, I guess not all hockey pucks are created equal. I changed my wife's summers out for winters yesterday and without having much of a choice, other than to use the jack that came with the car (No thanks!) I picked another one of my son's pucks that was in good shape and felt pretty solid. I did the back tires first where there is a lot less weight and the puck was barely scored so I did the fronts checking it after the first one, Maybe it had a lot to do with the temperature as it was only +2 celcius out but the puck faired real well, imo. Still don't want to continue doing it this way so I'll have to bite the bullet and purchase something more proper.