I got this book a few years ago hoping I could learn to do this infamous technique. I read the thing in less than an hour and tried following the guide and could not get mine to work. I am not saying that it won't work for you ($5? Come on, it's just $5, if it were $20 I'd be upset). It may or may not, some people have had it work.
However, I later took up Wing Tsun (Bruce Lee's art) and realized my mistake. The technique takes all of 5 minutes to be taught it, and then perfecting it takes a long time. There are no exercises needed like explained in the book.