I was going to say: 80% of the time you can expect 2.5 or 2.1mm
with positive center.

And you get to guess which 20% are otherwise!

And the hole down the center has many sizes.

Then Sony has decided to make about six different sizes and
color code them.  Which immediately brought to mind the quote
below (and Tim beat me to it...)

>"The nice thing about standards is that there are so many to choose
>from."
>author unknown

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