the shoulder
far enough
Yes, I did check that as one of the first things that could have gone wrong, as it was a young lad that cut the key and he looked as if he was having difficulty lining the key and blank up.
OK on your comment about the registration errors, I agree with you. When I was an apprentice fitter, I spent some time learning to make keys from blank to fit pad locks and this where I picked (pun not intended) up my knowledge of how they worked. I could make a key, using engineers blue that was used on surface plates, and have the lock open within 30 minutes. Worked all right until some one started to the same and steal tools from toolboxes. Ever since, I have never said that I could do it.
Dave