In article , Fred Hayek says...

I want to check the valve guide bores in an automotive cylinder head. I've
seen some small-bore micrometers that cost several hundred dollars. These
are out of my budget. Can I get an accurate measurement with the less
expensive "split ball' type gages, some of which are sold under good names
like Starrett and Mitutoyo, and a regular flat anvil outside micromeeter?

Yes. Those will work just fine. With a good feel you can
measure with those down below a thou.

Jim


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