Winning the drag race!
I like the pun & the hinge. Maybe it kept the wheels in contact with the track better.
I never had much luck with the cars; something always seemed to fall apart in the finals. I did win the rubber band rocket race one year; still got the trophy too.
We did the jeweler's rouge/dremel on the nails thing for my son's cars. It helped but he didn't win the final either.