Update on what I did with ZM1 today.
Summary: the UL flag now looks much better, but I dropped a screw down into the ISI and I topped out some adjustment screws.
After talking with Jeff K this week about what might be going on, I remembered that the UL OSEM flag was slightly askew from the other flags. Jeff's data may also point to a problem coming from that area so I wanted to see if I could straighten or align the flag today. I pulled the flag and rolled it on the table and you could see that the tip of the flag was not straight. I replaced it with another that I had brought with me and it looked slightly better, but still not great. Roll tested this one as well and all looked good, hmm. So I put it back in and then tried to move the OSEM in the desired direction with some success. All the flags now seemed to sit a bit lower, so I adjusted the height but I found that the screw to lock down this adjustment couldn't reach anymore. I'll have to get some longer ones tomorrow. Overall, the UL flag is now much more centered and the others are good as well.
As I was putting the earthquake stops back on I fumbled one of the 4-40 screws and dropped it right down into one of the through holes on the table (I blame the gloves). I could not see a way to get to it without removing one of the HAM side panels, so I will consult with SEI team and take action tomorrow.
After talking with Hugh and Jim it seems that we might leave this screw where it is unless it starts to cause some issues.
As a future reminder, I dropped a 4-40x.5" SHCS over the South corner of HAM6. It fell through one of the helicoiled through holes and dropped inside the table. The hole it fell through is above spring post #1, I am told. I did not see or hear it fall through to stage 0, and I could not locate it through the holes in the wall panels on the South-East side of the table. During their CPS investigation, Hugh and Corey had one of the access panels removed on that corner, but I also did not see or feel anything.