[M. Takahashi, Ushiba]

We continued the MN/PF OpLev base installation (figure 1 and 2 shows MN and PF OpLev base, respectively).
During the work, we found the gap between flanges on cryostat and one conversion flange from ICF 253 to ICF 152 seems not uniform.
So, MN OpLev base for that flange is not installed and we plan to work with Kimura-san next week.

The other 5 bases are installed and adjusted the inclination of optical tables by using levels.

We used 5 Technoport viewports deliverred in 2021 (#6 to #10) and T-support viewport deliverred in 2017 (#2)
Installed viewports positions are summarized in wiki page.