Try:
"Hey! Lets add a 10 iron between the 9 iron and the pitching wedge!"
"Yeah ... we really
need a 10 iron!"
"Why do we
need a ten iron?!"
"Because it ain't a nine iron!"
"Or a pitching wedge!"
But, of course ... that's not in keeping with the 14 club rule instituted in 1939.
Maybe a better analogy would be:
"Well, Seumas, we're up to five irons now."
"Ah think we kin do with some moooore."
"A six iron?!"
"Ah was thinkin' more along the lines of a four an' a half, laddie. The jump between irons may need refinin'."
(Fortunately Seumas sobered up and after his hangover decided "progression via regression" wasn't the way to go.)
![](http://www.golfeurope.com/almanac/history/his_trium.gif)