Project 4 of the Popular Science 5 Minute Projects with Craftsmen Tools is a Nut-and-Bolt Keychain. Downsize your pocket cargo with a custom-fit keychain. Editor Sean Captain ditches the ring and uses more tool than necessary to trim a small bolt to just the right size for his set of keys. (For a slightly different take on the project, see the site that inspired us: carlitoscontraptions.blogspot.com).
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