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).
PopSci.com 5-Minute Project Video: Nut & Bolt Keychain
Downsize your pocket cargo with a custom-fit keychain