This is how to repair the ball, if it gets knocked of the rubberband. You will need a needle nose plier or similar.

1.Start by pulling the split out of the ball, by shaking it towards the hole and grabbing it with the plier.
2.Put the rubberband through the eye of the split.
3.Now tie a knot around the split. Be careful not to tie the knot too tight, as this could lead to the rubberband snapping while playing.
4.Use the plier to put the split back into the ball.
5.Make sure the split is all the way into the ball before you continue playing. Have fun!