This book is for amateurs.The author, Anthony Whiten, was bitten by the horological bug and communicated his enthusiasm to others with the result, as he says, that he was asked so many questions he had to write this book! If the reader does not have the right tools or they are too expensive to buy, the author describes how to make alterations out of simple and easily obtainable materials, or how to avoid the necessity for the tool at all.