Get all the articles together. A rubber ball, a funnel, sand, gorilla glue,rubber patch.
Step2
Make a small hole in the rubber ball, big enough for the funnel to fit.Start filling the ball with sand using the funnel. Use a scale to determine how heavy you would like the ball to be.
Step3
Once the ball is full or full enough, cover the opening with gorilla glue, place the rubber patch over it and cover it with more glue.
DONE!
Novice 
