Hi Adam -- we're chiming in again only because you asked -- we don't have any of the boards shown in this thread,
and have been hands-on with only a few boards ever. The few we've handled didn't seem much thicker than
a heavy sheet of cardboard -- maybe 3/16" or so -- thus our initial skepticism that they could contain any sort of card.
But if the "cards" shown here are, if we infer correctly, about one inch in width, two inches high, then the accordion folds
they exhibit are no more than roughly 1/16". That inch-long, 1/16"-thick strip could be coiled into a tight circle
and placed inside the punch-out dots, therefore requiring no thickness of the punchboard greater than the circa 3/16"
that we've observed. And just from photo evidence, other boards are clearly thicker than that, maybe 3/8"-1/2".
We just took a look through our photo files, trying to locate any board with exactly 624 holes, but couldn't find one.
All the Diamond Dust versions we've seen have exactly 600.
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