Quoted from MarklarD:
I have that one in my machine. It looks nice and works well. I think it's 3d printed, where as some of the older ones might be made out of metal.
The one pictured looks metal, they are pretty hard to find and are a bitch to drill. We were making them on request a few years back when nobody else was making them anymore. We stopped because you need a heavy duty machine to drill out the big hole in the middle where the ball passes through. A typical drill press doesn’t handle it well. A dremel can work, but it eats up blades fast and it’s tough to get a clean cut. It’s also pretty fiddly to install so the ball passes just under the slot reel to get it to spin. So we stopped making them.
Here’s a link to a blank if someone wants to diy.