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[QUOTE="sutomcat, post: 3226555, member: 27"]
I believe the answer to this question is as follows:

When new pieces are added to the crown truss, you will note that there are always cables dangling down from the new piece as it gets rotated and put in place.

Once the piece is seated in the right place, those cables are attached to the appropriate backstay, and hydralics are used to tighten them, usually in two directions, to the point where the piece is stabilized in the correct position (the angle is really important).  Then the holding cables are locked in place and the big crane can be released to do other jobs.

It was really easy and interesting to see this happen with the box girder added today to the northeast corner, from the Link Hall camera.  Before the box girder got there, there were two cables holding the stand alone spiral the box girder was mounted on.  They were connected to one of those yellow collars they use for temporary stabilization when a spiral is first installed.

Once the box girder was put in place, they connected the cables on it to back stays, tightened them, got perfect alignment, then released the temporary cables.

If you go back a couple of hours, you can see the cables get connected and tightened for the new box girder on the northwest corner.  The angle isn't that great but you can see what is happening.  At this point, it looks like Walt will be released shortly.  The new cables appear to be up and pretty darn tight.
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