Here is a video playing one of his Balaroo in another room:
Today I got to play Balaroo with my son. The left six balls were mine, the right six were his. It was a lot of fun.
When I originally played it at Don's, I thought we had been very lucky that all the balls had fell. But now I know that this almost always happens if you don't stop the top, as it spins for a long time.
That US patent is from 1936 (#2049267).
I do need to replace the ball for one to play with and leave the original wooden (cork?) ball untouched, as it's disintegrating from bumping against the spinning top protrusion.