Alastair H. Greg G. Robert S. Thomas V. We were able to complete the alignment of this set of mirrors tonight. One of the 10-24 vented SHCS on the back of the SM2 mirror in BSC2 got bound up and broke at the head but we decided to move forward with the installation and were able to get the mirror secured. Although all the bolts are tightened down to their capacity on both mirrors, the alignment is still vulnerable to being bumped.