This English-language professional book is based on Impressioning Lever Locks by Ian McColl and focuses entirely on impressioning techniques for the non-destructive opening of lever locks, including clover-style locks and safe locks.
The book explains in a structured, step-by-step manner how impressioning is carried out using a blank key. It shows how contact and pressure marks are created inside the lock mechanism, how these marks can be correctly interpreted, and how they are gradually translated into a precisely functioning key. Detailed attention is given to the internal construction of multi-lever lock systems and the correct working sequence required during the impressioning process.
This publication is explicitly intended for professional locksmiths, security specialists and advanced users. It is not a beginner’s book, but a technical and practice-oriented reference work for those who already possess basic knowledge of lock mechanisms and want to deepen their skills in non-destructive opening techniques. The book is suitable as a training aid, study material or professional reference.
