When you are building something, you will use fasteners. Bolts, screws, rivets. Invariably, you will drop one of them. This is from a thread this evening and has to be one of the clearest explanations of what happens that I have come across:
I've learned a few things about losing fasteners in the muck. The distance traveled by a lost fastener is directly proportional to the time it takes to get a replacement. A dropped nail from a dozen in the hand will always land next to your foot. An M25x103.5mm fine thread bolt with a Torx T21 button head is somewhere within a 2km radius. It's a quantum function, though, because as soon as you put the new one in, the waveform collapses and the bolt will have always been right next to your foot.
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