Method of changing the rope, operational example
Pull out the bottom buckle of the ball.
Lightly heat the end of the rope to be changed with a lighter.
Insert the heated end of the new rope into the bottom buckle of the ball.
Tie the end of the new rope to the top of the old rope.
Firmly pull the other end of the ball's head.
Thread the new rope through the inside of the ball and pull it out.
Tie the top end of the new rope to the ball's head buckle.
Pull the other end of the new rope to fit the ball buckle inside the ball.
Press the lower end ball buckle into the ball to complete.