I agree, but there are tons on vids on this particular technique, I think because Tim demoed it on his site long before the book came out. I think perhaps this tech, is exempt from that rule - IMHO

But certainly all the techniques is not ok. I don't see a problem if it is one he has a free video on too.
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to original poster - You should get the book if your interested in all of his techniques, I own it and its awesome.