Have you ever wondered where the phrase 'to be fettered' comes from? Iron fetters were commonly used to shackle prisoners, ensuring they could not escape. The fetter lock, an essential component, featured a unique keyhole mechanism within the barrel.
This design added an extra layer of security, making it more difficult for unauthorised individuals to tamper with the lock. The keyhole's concealed position within the barrel meant that only someone with the correct key—and knowledge of the lock's intricacies—could open it.
