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Astatic is correct.
The supports are the classic pivoting triangles variety but the devil is in the details, as they say.
The cold plate has several layers. The main layer is a 3mm thick laser cut disc that is provided with 9 holes for the support pins to protrude. The holes are 10mm diameter, but the pins are only 6 and it is the second layer of the cold plate that stops the support triangles from rotating out of position. The second layer of the cold plate is a 1mm thick cork sheet that has 9 perforations of about 6.5mm fot the support pins.
The mirror is 38mm thick at the edge and started life as a classic full thickness (1 to 5 ratio) Pyrex blank that I sliced into two discs...but don't start me on that story.
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