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Hi John! Been a while!
You place an aluminium plate behind the mirror with some silicon heat transfer paste between the two. Running the peltier will suck the heat out of the mirror via the aluminium plate (cold finger). You may need a couple of them.
Trick is to get the mirror down to ambient, not form stalactites! There has been a thread on this somewhere on this forum I think? You can place a sensor on the mirror as well to act as a thermal switch when the mirror reaches ambient.
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