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Good luck Zero I will be following this with interest. One thing I have found is that copper cold fingers do add weight to the final assembly and the less you can use the better the balance on the focuser/scope. Is it possible to shave that copper slab down abit? The weight of the fan and heatsink will also put force loads on the cold finger within the camera and the attachment to the camera is important. A silver based thermal paste is adequate for transfering cold to the sensor back, I used Artic Silver.
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