Here's the one I built out of one of those eyeball camera's
Don't laugh about it being crude as it works and was probably the first one to use the video window with Mach3 as I contacted Art to see if Mach could use an outside application we were playing with.
The rest is history thanks to Art.
It's just a steel 'pot' with 4 M4 holes tapped in so it adjusts like a 4 jaw. The camera is off the shelf but just had the back sawn off with a hacksaw
This one is on a 5/8" spigot so it fits any collet you want to use although that's not written in stone.
It does work and works very well, it goes to shows with us on a converted X3 mill and this together with thread milling are the two main interests shown by potential customers to Mach3.
John S.