The Weight

One major change to Barry's design is the wight. He doesn't mention any weight. I figured out it myself. If the acrobat doesn't do the shoulder-flip, you should put some weight on it. The more weight you put on, the faster he will turn. Too much weight causes that he falls on his head. Later, I used larger balls (13 mm instead of 12) and found them better. With the large balls some didn't even need any weight. (Maybe that's why Barry didn't need to use any weight.) The figure would work pretty well without any weight, but would not stand freely. However without weight the movement was a little too slow, so finally I put a little (1 or 2 sheets) in them.

Put the weight on the frontal side, on the head, neck, chest area. For some figures even the stomach worked well. I used metal sheets from an old printer's transformator. It was easy to add the sheets one by one. Usually 4-7 sheets were needed which is about 3-6 grams.