One thing missing here, but talked about (albeit not very clearly) in the video is that it’s not even a tension indicator, but rather, extension indicator. As l

One thing missing here, but talked about (albeit not very clearly) in the video is that it’s not even a tension indicator, but rather, extension indicator. As long as we are in elastic regime, tension and extension are the same thing (Hooke’s law). However, once you go beyond it, tension goes down even as extension goes up. This is what the canuck meant when he talks about people tightening the loose bolt by giving it extra tweak, around minute 3:40 in the video. Once you leave the elastic regime, the bolt holding strength is permanently reduced, and by periodic tightening, sooner or later you’ll see it yield altogether.