What is a AAA shaft?

[macguy]

What would differentiate a AAA from an AA?

How about the difference between a AA and a A?

Is there a published guide of shaft wood classification?

It is like when Justice Potter Stewart tried to explain "hard-core" pornography, or what is obscene in 1964 by saying, "I shall not today attempt further to define the kinds of material I understand to be embraced . . . but I know it when I see it"