hello mr Potter; i live in Canada. Trying to learn new trade. i have purchased the entire set of books published by Dave Mcomie as well as the huge books by Tobias. Also have numerous safe doors,practice locks,etc.. I cant figure out how to read/decipher wheels thru changekey hole. Its referred to all the time. HOw am i to learn? I can always figure out wheel number 3,but am lost trying to see thru to wheels 1 and 2?? I noticed your name in the savta mags,hopling u may be able to help? thanks,Mike