We’ve installed a few tether ball systems in Uganda through the years. The problem has always been tether balls. We have been unable to find them in country, so we have had to bring them with us from the United States. And I’m not so sure that eventually, if they do not get worn out, they aren’t converted into soccer balls. Thus, despite the fact that tether ball systems are low-cost and kid friendly, we have been hesitant to install more of them.
Perhaps, we have found a solution, and they can be put back into a playground design.
Recently, during a trip to the Cuzco/Sacred Valley area of Peru, we saw tether poles with socks filled with sand replacing the balls. The socks were functional and a serviceable replacement for the balls.