Some discussion about whether or not the TGG crystal in the output Faraday should be epoxied in place
or should be floating.  The two rotators examined thus far, SN002 and SN003, have the TGG crystal
loose within its containment sleeve.

    Attached are pictures of the spare TGG crystal.  The hole in the sleeve, which maybe a vent hole,
is clearly plugged with something that is hard to the touch (VentHole.jpg).  Looking at the inside,
one can see where said substance has spread on the inside (Blister.jpg).  Without prodding the crystal
too hard, it did not move.  Obviously there are no magnetic fields to hold it in place in this case.