Rest assured that the stem is on spec. They don't tool up to make thousands and get it wrong.
So we're all on the same page. the
measurement is center to center, down the center of the extension.
I'm sure that if you measure correctly, you'll get the right answer.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.