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       xkcd - A Webcomic - Screws (1474)
        
       Image:
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       If you encounter a hex bolt, but you only brought screwdrivers,
       you can try sandwiching the head of the bolt between two parallel
       screwdriver shafts, squeezing the screwdrivers together with a
       hand at either end, then twisting. It doesn't work and it's a
       great way to hurt yourself, but you can try it!
        
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