Last night, we finally obtained successful transfer function data on both the main and reaction chains of the ETMy.  As expected, the main chain looked clean (we'd taken sneak peeks prior).  However, the reaction chain looked bad.  So, we went out and found a tough-to-see earthquake stop touching the reaction chain top mass.  This cleaned up the TFs.  However, alleviating the stop made the reaction chain pitch change.  Realigning the chain made the lower stage sensors fall out of range of course.  After fixing all of these, we discovered the TF's had again gone to h*ll.  I scrutinized the EQ stops, all flags, and all other potential spots for mechanical interference.  Finding nothing in error, I gave up for lunch.  TFs of the main chain are still clean so the interference must not be between the chains but to the structure, BOSEMs, or EQ stops.  Will go hunting again after lunch.

We'll need to abort the spool replacement effort scheduled for this afternoon since we will continue to need the IAS equipment set up there until this QUAD satisfies both alignment and noise parameters.  As usual, it is difficult to get a QUAD to satisfy both at the same time.  I expect another round of TFs to be taken tonight since convincing ones self that the TFs look good is particularly difficult during low-coherence daytime measurements.