How a pin tumbler lock works
Five pins, five splits, one shear line. Why a lock opens with the right key and not with force.
Guides
Guides from the counter: how locks fail, what the grades mean, rekey or replace, and how to spot a locksmith scam before you pay one. Every guide is dated, names its author and lists its sources.
Rekey or replace? A plain answer
If the lock still works and the keys are the problem, rekey. If the lock is worn or weak, replace it.
Spotting a locksmith scam before you pay one
A fixed price on the phone, ID before the door, and no drilling you did not agree to. Three things honest locksmiths do.