At Maker Faire Bay Area this year, Jay from MakerBlock found himself needing to tighten some wingnuts, but he didn’t have a wrench. Rather than asking around (I’m sure he could have found one with all the makers on site), he hacked together a solution on his own. It’s super simple: just one piece of paper. Roll it up into a tight tube and fold it in half. To use the paper wrench, place the paper tube around the wingnut, squeeze, and turn. Jay says:
I used this same exact paper wrench with a small 3mm hex wrench to tighten bolts on my project box. Just as with the wingnut, the paper wrench let me get a better grip on the hex wrench and tighten the bolts without hurting my fingers.