Today, Travis and I finished assembling the ETMX lower reaction chain. We assembled the PenRe mass in the structure, attaching the balance of parts to make the weight from last week including AOSEMs, cables, and cable routing brackets. We then installed the new annular AERM07 mass below the PenRe in the lower structure and adjusted it in it's 6 DOF's by eye before suspending it. We then reclamped everything and rolled the main lower chain up to it. A quick lift via the Genie duct jack and we set the main lower structure and newly fiber'ed masses into the trolley with the reaction set. We added the UIM and PUM magnets/flags (set with polarities per the QUAD controls poster), and then shoved the 2 structures together and fastened them.
We wrapped the now complete lower unit and rolled it to the chamber side. After attaching some of the LSAT lifting blocks, we staged the Genie duct jack so that we are ready to install it on the arm and into the chamber tomorrow.
Note - Travis noticed a door bolt sitting in the BSC9 flange in the unused hole at 3 o'clock. The washer from the bolt (which held nothinglooked to be rubbing funny on the o-ring so he removed it. The vacuum crew will need to inspect this after we remove the install arm. (Note, the install arm and stiffening flanges cover most of the right side of holes and o-ring on this chamber, except for a ~6" gap at 3 o'clock. There are o-ring covers everywhere else. This bolt should not have been in this hole, since it served no purpose.)
From Chandra and Kyle who inspected this o-ring portion yesterday late afternoon: