Bicycle valve lock
thingiverse
At my son's school some kids think it is fun to unscrew the valves of the tires of the bikes so you have a flat tire. It is a not uncommon issue also at busstops or everwhere where many bikes are parked. This lock will prevent this from happening. Put it over the valve and lock it with self-locking nuts and bolts. It fits standard valves, not the french ones.
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