Yesterday Travis and I installed the Non-Magnetic Blade Dampers and the Bounce Roll Dampers on the UIM stage of the main ITMY chain. This required the removal of the unused copper damper shafts (as per procedure to compensate for the added weight). We then checked and realigned the ITMY reaction chain CP since we had reason to believe that it was mis-pointed in pitch relative to the main chain (alog 33809). Recall that the CP-HR surface should be co-aligned with the ITMX-AR surface. Since the ITMY was slightly misaligned on the oplev (venting or not well aligned recently...), we centered it via some smallish bias. The new ITMX BIAS for our in-air alignment is:
P = -56 (was for Aug locking P = -37)
Y = -176 (was for Aug locking Y = -207)
With these, one of us then walked down to the Y-manifold and hollered suggestions back down the tube while the other one of us adjusted the reaction chain at the PUM to steer the CP-HR to overlap with the ITMY-AR. After a few iterations, we managed to get the beams to overlap. We fine tuned it with P = -150 on the reaction bias slider.
Likely the commissioning team will need to move the ITMY back to either where the sliders started, or another slightly new pointing, but we could use these bias values to point the CP to follow the ITMY later.