I watched this guy. Uses a blank key, sprays some ink-stuff on it. Inserts into the ignition. really hard forces/wiggles it to get an imprint on the ink on the key. Goes to the cutting wheel and cut the profile. Re-insert into the ignition and test. Fine tunes with a pencil file. Makes it look sooooo easy. I tried it at home with a lock I lost the key for. Gave up after 30minutes and cut it off with bolt-cutters.