Just a rough guess, but being the black dots (shadows) are slightly off centered due to a slight camera angle it leads me to believe there is a small pin in the middle of the hole. If there was a hole in the center of the cups the shadow would remain in the middle no matter the camera angle. Just speculation though. Could just be an odd reflection.
But if there is a pin I would be very interested to know if it stuck up inside the jet tube a bit. I do doubt this is the case though as I remember Cathar stating the holes were not precision drilled. Then again if the jet hole was big enough and the pin small enough the holes wouldn't need to be to perfect.
Problem with this theory is it removes the jet impingement effect. During the Cascade development I remember a flat bottom was optimal for jet impingement to work at it's best. maybe the pin sticking up into the nozzel adds enough volocity to make up for this and then some though?
Bah, to much specualtion. I will wait until we know for sure whats going on in there.
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