Yesterday Steve and I revived two legs to mount some optical breadboards outside of the end table.
These legs had been used as oplev's mounts many years ago, but now they are served for 40m upgrading. These are really nice.
By putting them on the side of the end table, a mirror mounted on the top of the leg can reflect the beam outside of the end table.
Once we pick off the green beam from the end table to its outside, the green beam can propagate through the 40m walkway along the Y-arm.
So that we can measure the beam profile as it propagates.
These legs are also going to be used during mode matching of the vacuum optics.