woodruff key size

What is the size of the woodruff key? I managed to lose mine and the local hick dealer just has a bag of keys and doesn't know the size either. I don't want to have to take the entire motor over there just to find out they don't have it.

Well after deciding that it was four pennies and a dime wide :grinno: I found out that he didn't have it. . . So I had to order one, another opportunity for more shipping shenannigans. :disappoin