Reference: TRANSMON ISC EX Layout D1201457
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Put a reference flat mirror between M5 and telescope, and the beam didn't retroreflect when QPD servo was ON.
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This means that the bottom periscope mirror under the TMS ISC table is exonerated.
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The beam was pretty well centered on M2 but too high on M1 and M3, so changed PIT if M2.
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We ended up splitting errors between M8 and M1, M1 being too high and M8 too low but good on M3.
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Used M3 and M6 to steer the beam spot on the primary and the secondary to mimic what's supposed to be good according to https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=7285.
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Used TMS BOSEM bias to rotate the entire thing so the beam retro-reflects off of ETMX.
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Unfortunately we needed a large YAW offset and the F2 and F3 DAC railed.
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I'll talk with SUS people to find the best way to mechanically rotate the TMS suspension in YAW. We'll probably move the top blade.