Replying to
@deviantollam@defcon.social I think people are turning down this job because it's a bastard thing to make. If the ball is at most 1/8" wide that necked down section looks closer to 1/32" proportionally. It's not very strong to resist machining forces. Think about a (non-hardened) rod stock that size, you could just bend it with your fingers.
This feels more like a tool making process. It reminds me of a ball burr with no cutting edges on it. I wonder if you could get a tool company to make some that way or grind one smooth.
Could this be done with SLS 3D printing instead? What kind of forces are this thing going to encounter?