Buttermilk? When did you climb it? If I'm right, I've seen climbers groveling up that crack in years past.
It's not Buttermilk, but I think I know the route you mean...the pitch just left of the last pitch on Buttermilk looks very similar but has a smaller roof and a steeper intro.
The route in question was climbed last year and isn't too far from Buttermilk.