While checking out the guy wires on the 3.2m axial flux generator I found out this:
One of the shackles holding the guy wires had loosened up and almost completely threaded out. I do remember tightening them all up properly, but I guess that the nature of these shackles is that they tend to loosen up under variable load conditions. That is, because only the U-section is providing pre-tension on the threads, and I think it's not enough to hold it. If you use enough force, that the solid part of the bolt jams into the female threading, it seems to help some, but seems like it's not completely secure either.
To prevent this happening again, I've added thread locking compound to 3 of the guy wires, that normally don't have to be taken apart when lowering or raising the tower. To the one that needs to come off when raising or lowering the tower, I added a safety wire to prevent it completely threading off.
Something for everyone to consider, that are using this kind of shackles in their tower rigging.