It should *not* be necessary to place this target inside the manifold. The OptLev beam reflected from the first CPy surface should be visible at all times through the viewport as the pitch is adjusted. If you opt for this approach then of course the person at the view port shoudl be in radio communication with the person making the pitch adjustment inside the chamber.
The direction of CPy pitch correction is for the top of the CPy to move in the +Y direction by about 0.23 mm.
See LLO elog #28336
https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=28336
DCC Version 3.5.0, contact
DCC Help