Last week we swapped QUADs out on the mechanical test stand.  This never being done before, it took a few days to work the kinks out of maneuvering 4 sections of QUADs simultaneously.  Currently, the Q1 upper structure is in it's case waiting for an N2 purge, while the lower structure is parked in the modified LSAT Top Plates on the "installation Genie".  It's case will not arrive for a few weeks yet.

Q2 was fully hung earlier in the week.  As of today, all 6 DOFs have been adjusted mechanically so we are installing the tablecloth and BOSEMs.  A final tweak to pitch will likely be needed during the OSEM installs over the next day or so.  (Note our alignment is to within a few mRad in pitch with the 5mm gap between chains set with a 5mm spacer.)  The chains are slightly misaligned laterally (side shift) with the barrel of the ReTM set <1mm off the barrel of the TM.  We could adjust this out at the expense of overall height of the Test Mass.  We opted to live with the slight side shift for now.

Q2 has one Top Stage Blade cartridge which is almost out of yaw range in one direction.  The screws are very difficult to adjust under normal circumstances, but one of the outer most blade clamp 3/8-16 is feeling very rough when loosening.  The yaw which is somewhat pinned is the motion of M0 in the counter-clockwise direction as viewed from above.