Another one of those books that I can’t believe we haven’t covered yet is Guy Lautard’s The Machinist’s Bedside Reader series. So far he’s written three volumes in this series. The books are a compendium of projects, instruction, and stories from the eclectic mind of Guy Lautard. There’s too much in the books to clearly lay out here, but the first volume has everything from an article on a drill sharpening jig for tiny bits to making a sling swivel base for a tube-fed rifle. Some of the articles deal with gunsmithing subjects, others with precision work above and beyond what’s normally done in the small shop. The books are, as the title implies, excellent bedside reading to fertilize the brain for future projects.
You can buy the book directly from Lautard himself, or from a number of sellers such as Amazon.