It has some serious damage potential. I'm not sure what the final weight is, but it's made of some scrap steel I found in the drops bin. It has a 3" ball with 1" spikes that are Very sharp, for a total of 5" diameter. The handle is oak with steel endcaps, drilled and tapped for a 3/8 rod that runs through the handle. The whole thing is pretty heavy.
As for indexing, well, I'm sure there's an easier way of doing it, but what I did worked. So here goes. After rounding off the first half of the ball, I drilled and tapped it for 3/4-10 and made a rod to go in it for chucking to. Then I did the same process with the other side of the ball, but used 1/2-13 instead. Again, making a rod to fit.
I mounted it in an indexer on the mill and drilled the holes perpendicular to the axis created by the two threaded holes; one of these holes was also threaded to become the next indexing axis. After drilling the next set of holes (tapping 2 of them) I indexed it at 45 degrees one way, the 45 the other.
I know that sounds confusing. You shoulda seen me trying to figure it out in autocad. It ended up being easier to do than it is to explain, but I still would do it different if I did it again.