I have a copy of my house key cut by my local hardware store that doesn’t work. This the 3rd try for them of this copy. The copies were made from two other keys: one copy, and one original to test out “copy-of-a-copy” error magnification.
I finally took the cylinder out of the deadbolt to try and see why it won’t turn. All of the pins are not rising high enough to be flush with the cylinder, with one pin being exceptionally low. This explains why the only way I could ever get the key to turn sometimes was by bumping it.
Why did / is this happening, and how can I make sure it doesn’t happen again when I get this copy redone?