This morning, Jason discovered that the OMC in HAM6 blocked 1 of the 4 of his lines-of-sight thru HAM6 to HAM4 and 5.  Travis and I went into HAM6 and pushed the OMC out of the currently needed beam path.  We will likely need to push it again for the next beam paths...  (Note, we also had to move on of the 2" steering mirror assys on the HAM6 table which also blocked the beam.)

Then, Travis and I wrestled the PLX periscope assembly into HAM 4 and aligned it to the incoming IAS beam - this took a couple hours.  The PLX wrapped the IAS beam around to bounce off of the relatively flat SR-AR surface.  We spent a few hours aligning SR2 in yaw and pitch via twisting the suspension tower on the table and pushing weight around in the suspended intermediate mass pitch mechanics.  BOSEMs were adjusted to accomodate the pitch correction - this involved also tweeking the table cloth plane which holds some of the BOSEMs.  After a few rounds of adjustments and mechanical interferences checks and fixes, we finally have the SR2 pointing within tolerance, with clean looking longitudinal and vertical transfer functions.

AOSEMs are not currently aligned and are pulled back to show no swinging signal.

Jason will add details of the beam pointing and the subsequent SR2 final alignment measurement.

Arnaud has started a full sweep of TFs on SR2 with will run for the evening.  We'll evalute them on Monday to determine if we can move on to the next suspension in HAM5.

A picture of the PLX assembly is attached and should be incorporated into IAS documentation since we had to rebuild the PLX to get it at the correct height a few times with a variety of spacers.  LLO reports that they had to do the same with a different variety of spacers, but there are no pix of that assy to date.