A major carousel drive systems replacement was performed in March 2000. This project included preparation for the the new holography receiver. General images of the source and receiver are available . JAC was responsible for several items of mechanical infrastructure. A slide show review of the hardware is available.
Some photos are available.
The carousel skirt is non-concentric with the concrete basement, with gaps varying from an inch or so to more than six inches . The polarimeter mount has been decommissioned. The project aim was to improve the mounting of this instrument , to meet the user specification. Some images of the design are available. As part of the design work, we disassembled the polarimeter to verify some dimensions and machine a few changes.