The SUS Team

We've found welded repair plugs (by quick visual inspection) in the prism mounting holes of an M2/M3 metal mass (D080368) used in BSFM triple suspensions. 

See attached photos.

Though we replace the lowest stage (M3) of the BSFM's metal mass with fused silica for final in-chamber suspensions, the M2 mass is identical to the M3 mass, and remains in the suspension. In addition, for the H2 OAC, we are to leave FMY's M3 as a metal mass.

Two other masses have been checked for similarly visible repairs and none were found.

Stay tuned for further details.