I was intrigued by this thread so I built my own for $13. It works a lot better than my old 5 gallon bucket cleaner as you can apply more pressure to the balls. The only downside is it can clean only 3-4 balls at once. I used a 6in pipe coupling ($6), a buffing adapter for a cordless drill ($6), a piece of cardboard, some carpet scrap, and a 10in buffing pad ($1). I cut the cardboard to fit in the internal diameter of the coupling and wrapped the buffing pad around it, then pulled it tight through the bottom of the coupling. The carpet is too thick so I'll replace it with something thinner in the future.