I learned that the wheels on a Cub Scout Pinewood Derby car are a pain in the ass to get nailed in evenly.
Did you also learn that it's super annoying if you go over the maximum weight? You'll spend the first hour of the derby drilling holes into your car just to make it lighter so it actually qualifies for the race.
I learned that one last year. I have a shop scale now, and we're at 4.953 ounces. The max is 5 ounces.
I don't remember this being such a hassel when I was a scout. Maybe I should ask my dad.