The guys began attaching the new collars that will provide a much healthier interface between the SAC & the telescope. The aluminium collar was fitted to the simulator jig that will support the SAC throughout the testing & alignment process. The steel collar will bolt onto the existing interface ring after some modifications to the temporary gear that's currently holding the SAC in place. After that, the 2 collars will be allowed to get to know one another... In the meantime, we got to gawk at Darragh's "dustbin of mirrors" from all different angles!