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simplicity gentlemen!
items -
1 pump (maybe a reservoir)
1 length of plastic pipe
fill pipe with radiator coolant (so it don't freeze)
2 wraps of the pipe around the edge of the mirror then bring it out and two or three wraps on the outside of the tube and connected to the pump
theory -
external tube picks up ambient temperature of air/scope surface and transfers it to the mirror
comments?
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