We have an old numbered key, that looks like a regular key, but it seems it is numbered, so the locksmith refuses to copy it without our landlord coming with the original.
Our landlord would obviously not want us to have more than one person live in the apartment, so he would not cooperate.
So the question is: how to copy a regular key (no fancy double cylinder or more) for which, however, there is no key blank available?
I assume it would be sufficient to thin a thicker blank, and then engrave the sides properly, in addition to replicate the teeth. Do locksmiths offer such service?
I discovered that there exist some key blanks that are matching multiple key types. These blanks typically look very skinny in the middle, so that they would pass through different keyways (still belonging to the same producer) . I eventually managed to use one of these key blanks, but of course their cutting requires a locksmith with a minimum amount of skills. Thanks for the advices!