Measuring how much a head was shaved?

Measuring how much a head was shaved?

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fshd4it said
Don't know if this will help, I think(?) it's from one of my old DC books. Now it's just another picture on my computer...

View attachment 1715640983

Wow...that helps.

No rocker stands in these heads...long ago machined off.

I thought about a straight edge over the chamber and using a feeler gauge.