As part of my larger investigation into IM alignment jumps, I drove IM1, IM2, and IM3, in pitch and yaw by -300 "slider urad" to measure the change in the OSEMs.

The first chart shows the response to the change in alignment drive of -300 "slider urad", change in "OSEM urad", the change on IM4 Trans QPD, and the expected change to the alignment slider drive to change the OSEM urad by 5 urad.

In pitch, the alignment slider changes are about 40 times the OSEM value changes, which is due to the magnetic damping in pitch.

In yaw, the alignment slider changes are about 10 times the OSEM value changes, so closer, but not all that close.

This alignment slider calibration may be something that should be updated.

The first plot also shows what alignment slider change is necessary to move the optic 5urad.  I used these numbers to produce the second table.

The second table shows the drive change calculated in table one did produce a 5urad OSEM change.  It also showed that in the axis that wasn't being drive, there was up to a 1urad shift in alignment, which happened in both pitch and yaw.

Diagonalization of the IMs may be something that should be updated as well.