Impressioning is a way of cracking a lock without the hassle of picks and tension levers. Another definition of states that it is way of making a master key that can be used over and over again.
With some easily available tools and this guidebook, you will be able to learn the art of impressioning keys. There is enough information in this document for one to be able to acquire a sound understanding of the impressioning to enable you to build your own master key.
Learn the art of Opening Locks by Impressioning with this some basic tools and this easy to follow document.