Clutch Head Screws - History & Lore
In this "Socket Obscura" / "Tool Lore" crossover episode, we look at the Clutch head screw. AKA butterfly, bow-tie, figure 8 or hourglass screw. That strange screw that never caught on, but never quite faded away. CTA Hardhandle Drivers: https://amzn.to/3P43QKV CTA Bit Sockets: https://amzn.to/4rCKVEy Random Chinesium Bit Set: https://amzn.to/472mzfQ (As an Amazon Associate I earn from qualifying purchases) Join this channel to get access to perks: / @ballinator United Bolt & Screw Patents: https://patents.google.com/patent/US1... https://patents.google.com/patent/US2... https://patents.google.com/patent/US2... 1946 Clutch Screw Ad: https://www.rfcafe.com/references/rad... 00:00 Parody Intro 00:29 Overview 01:04 Who invented them? 01:45 Why were they invented? 02:12 Why call them Clutch Screws? 02:40 Who manufactured them? 02:58 What tools work on them? 04:35 Can you use a flat blade? 05:09 Outro
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