Taped an iPhone to the tub-side of the 41-inch flange, positioned so that its camera could look in toward the instrument's KRS-5 window without obscuring too much of the TAAS beam. Surprising that Skype works in the closed up tub, but whaddyaknow.
Pictures below correspond to ~diametrically opposed positions on the 'mystery' aperture corresponding to the dotted green line two posts back, just where the TAAS image starts to clip on it.
It seems conclusive that the mystery aperture is in fact the black ring holding the window in its mount. Why this isn't exactly concentric with the flange opening (dotted red line two posts back) is something to ponder....
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Based on what weve observed so far, it would appear that the center of the s/d/f aperture does not coincide with either the center of the window or the center of the 41-in flange.
We might be able to rectify this by re-steering the fore-optics ellipsoid. Maybe using the laser-in-the-bumper method as before, but intentionally steering the spot off the pinhole to compensate for the observed misalignment? I'm not sure that I have a physical justification for this, given that the hole in the bumper that we've been centering on pretty much has to be concentric with the window. Maybe the magnitude of the re-steer will turn out to be small enough to fit within the uncertainty of the laser position...
It also appears that the window is not concentric with the 41-inch flange hole. This one is very hard to swallow for me, but perhaps it's a parallax effect caused by the mis-steering of the ellipsoid?
If no one has a better idea, I'm inclined to disassemble and try the offset re-steering idea. This will take a couple of days, so if anyone sees it as a total waste of time, please speak up :)
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