I am quite sure that there are no internal cables within concrete that can be tightened or loosened. They simply did not build the center support that should have been from the ground up to the top of towers, then the cables down in the places with exposed bolts awaiting them. This was a Cluster Foxtrot, and someone needs to go to prison for murder.
Wow, I was wrong. I would like to see how often this “post tensioning” is used. It is a failure waiting to happen IMO. How can concrete, which by its nature inflexible, be counted on to move without cracking over time? Concrete gets harder and harder as it dries. Concrete is never completely dry. The drier concrete becomes, the more likely it is to have micro-fractures.
I have one question for engineers, were the floors in the Twin Towers post-tensioned concrete panels?