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Hey Mike,
not bad for a klux, your electrical knowledge sounds on a par with mine!! At least that is what Robby says.
Nice job, very nice.
Can I suggest that you look at a single LED placed in a neat hole at the crosshair plane. I can send a picture if it helps, but two of my finders have illumination, and both are a simple screw in LED/bettery, fitted to the same plane as the crosshairs. OK, you will have a hole in the side of the finder eyepiece, but as long as you use a small, neat fitting LED it will be unobtrusive.
Other than that, stick with what you have.
Now you can look at fabricating a dew heater.
Gary
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