I know what he's talking about, the middle section of the key (the part you don't cut into) is thinner on some keys. I even had a Mr Minit say he wouldn't cut the NATS key for me because its totally different (to my original key) and it wouldn't work. So brought it to someone else, got it cut and what do you know, it works (doors, ignition everything). I have 2 original keys and 1 has the thicker middle line the other one is thinner. The NATS key is also thicker down the middle. Doesn't seem to make a difference.