M8/13 mm "Toilet Seat" Socket Wrench
thingiverse
Toilet seats around here are usually fastened with a 13 mm hex nut on a long M8 bolt. You need a special socket wrench type thing for those which is usually included, but of course gets misplaced by the time you need to tighten the nut. An ordinary socket wrench will not work because the long bolt bottoms out way before you reach the nut. I quickly whipped up this one to help tighten a loose toilet seat. It won't take a lot of torque obviously, but for that purpose it's ok.
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