david, 
Fixing my colleagues chair in the office (as you do), and found a loose bolt designed for a hex key (allen key).
Soo I break out my tools, hmm, 4mm is too small, 5mm is too big. Wtf? I don’t have a 4.5mm bit or hex key, so I rummage around in our random keys.
Turns our it’s #^%£ing IMPERIAL. 7/16ths to be precise. Gah!
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