[comdpa]

Tong . . . How many dimples over from the center line would you say defines "aft"?

Not Tong, but with Mr Kelly being an "either it is or it isnt" person, one or even half a dimple over the center line would define aft. It is either black or its white. That is what I think he is like from reading the book and hearing anecdotes about him. Yoda should be able to confirm.