To brute force it, don't you need to know the alphabet used? Without a few sample keys, you won't know which heights to set to your brute force keys You can ho

To brute force it, don't you need to know the alphabet used? Without a few sample keys, you won't know which heights to set to your brute force keys You can however use other properties of the lock to avoid brute forcing it, and get more like a gradient descent: A blank key will be scratched by pins that are set at the wrong height, and you can keep filing and scratching till it's at the right value