As a former Cub Scout pack Master I must advise you that modifying the
wheels other than truing the roundness is not legal.

Well, it's not really Cub Scout pinebox, it's AWANA Grand Prix. Same
cars, etc. And you can't modify the wheels here either, but you can
place the wieght anywhere you want on the car. My test car passed the
legal check this year.

Tillman