Alexa, Keita, Stefan and Sheila-

We have the last optic mounted and balanced in a tip tilt (SN 33) for HAM 6 (OM3).  We had difficulty balancing this the optic in this tip tilt,  even with a short bolt, 2 nuts and a washer on the back side we could not balance it.  Keita brought out SN20 and 25 which are intended for India (and do not have cables attached).  We had a similar problem balancing one of these.  Keita then noticed that there is slop in the four scews that attach the piece that clamps the wire to the rest of the mirror holder (picture attached, these are the 2 bolts on top and the 2 bolts on the bottom of the photo.) The tip tilts we were able to balance had those screws centered in their holes while they were off center in the tip tilts we were unable to balance.  We centered them on the india tip tilt and then we were able to balance it using a dummy optic.  We then did the same thing on the TT that was originally intended to be the H1 spare (SN33).

In the process we used a dummy optic from iLIGO that has a scratch in the center to avoid chipping more real optics.  

We took parts from TT SN9:  the peak nudge  (which was missing from SN33), the small screw that tightens the balancing bolt (we dropped this) and one of the OSEM flags (one flag on SN33 was bent).  

In the end, we have not changed anything for the india tip tilts (SN 20 and 25) except correcting the position of the small bolts, we have 3 balanced and ready for HAM6 (SN2,4, and 33) and one H1 spare (SN9) which is missing parts and needs the wires reclamped.  

On monday I will double check all of the serial nubers written in this alog to make sure they are right.