And oh, if you DO happen to do this, the nut can be extracted using the cleaning rod for a Camelbak reservoir, the long one with the little brush on the end. Just push it through until it goes through the hole in the nut, pull back, and the bristles will catch the nut just enough to pull it out.
Yeah, you know how I know this... :-).
-- Badtux the "oops!" Penguin