your video seems to explain all of it already, it's basically an etching process that he's using to cut all the way through the blade. Personally I wouldn't use such a method because I would have to deal with oversizing the templates. However,
CVScam is a member of this site and you may have better luck sending him a PM.
ahh cjames beat me to hitting the post button, oh well
They call me the King, the big King. King Killa big wheeler cap peeler.