Has anyone ever used these for checking the bores?
You can do the same thing much more cheaply with pin gages. I use them for quick checks to see if things are within service limits. If further investigation, machining, honing, or fitting is needed, I use Sunnen Dial Bore Gages.
https://www.mcmaster.com/gauge-pins (https://www.mcmaster.com/gauge-pins)
Thanks for that. Way cheaper.
I've got a set of those balls, but have not used them yet. I'm also interested if anyone's used them and how they like them, or not.