My Pete rebuild

[Nostalgic]

https://www.mcmaster.com/#20365a15/=1dqk9pr

Here's a budget depth micrometer that would be a lot more accurate. You know, even between skilled machinists, the guy twisting the ratchet can affect readings up to .0005"

If I had the cutter, this is the only type of depth gauge I'd use for measuring the counterbores.

If you're Starrett loyal, It's a little more of course, but if you're like me and like tools to match.

https://www.mcmaster.com/#2051a42/=1dqk633