the advance secrets for finger sensitivity is "YOGA" what a joke. he refers to a few locks, like the american lock stainless being a tough lock! oh my god any amateur knows its a three second lock to open and two of them seconds is getting your tools out! please save your money if you are looking for a book you already know more than what is in this print. the new updated special personal tools that it describes, hmmmm. don't waste the grinding wheel on these ideas.