Gary brought this up at a recent SUS meeting, but today, I am back in the lab paying closer attention to it:
We continue to fight the fact that the jaw on the wire clamps want to swivel in the slop of the through holes when we lock them down, creating an "over hang" of the jaw (see picture of the BSFM one we are working on).  I know for iLIGO, people were concerned about this interface as a rubbing noise source.  As well, Gary pointed out that it can rear itself in a form of differential pitch when in wire pairs.  I'm not sure if this is a noise problem, but heads up with this nice picture.  (Note, we tried very hard to clamp the jaw while holding it against the torque that the head of the screw induced, but to no avail.)  I think we should at least use washers here - I've placed an order for a batch to try.