Kyle, Gerardo 

Sensitive testing possible now that "gross" leak is fixed and pumping via turbo.  YBM pressure ~8 x 10-7 torr.  Turbo header valved-out, 100% of turbo throughput routed through leak tester -> Found a 1.1 x 10-7 torr*L/sec leak on untested 4.5" CF blank -> Torqued screws and now < 5 x 10-8 -> Found 1.7 x 10-7 torr*L/sec leak on coax feed-through appears to be left feed-through (of 2 on flange) and not CF joint-action? -> YBM viewports checked OK with indicated background 5 x 10-10 torr*L/sec at time of this testing. -> Replacement feed-through flange from Friday doesn't leak now but may in the future as I think the flange screws are bottomed out and not in tension.  We may revisit this flange the next time the YBM is vented?