>>834268That's an implementation problem not a concept problem.
Every few years I have to deal with
>the keypins wore down and now my key doesn't workbut that's not a problem with the concept of pin-tumbler locks.
Just as the bible and keypins should be steel to cope with being on the front door of a block, and if they're not it's an implementation problem, the battery and the backup battery shouldn't be able to simultaneously fail, and if they do that's an implementation problem.
