Sorry to correct you Bets, but I happen to be re-reading (for the 100th time) Bruce's 2nd book, and came here to see what questions people had.
The Little Finger Bending exercise is to practice the feeling of Placing Intent.
Wahunka is the name Bruce gave to an odd sensation he had been able to switch on since the early 1970s. Page 27, "When I intended to switch the feeling on, I experienced a mildly electric, fuzzy ball of something at the base of my skull, in back, right where the spine ends and the skull begins."
Maks, I can't say that I've been able to experience Bruce's Wahunka. I do think I get something a little similar in my forehead, but I am not sure it is the same thing. I'm practicing with mine the way he did with his. I think maybe these feelings have to do with chakras??