Thanks for the link. Yes, the suggested Mini LED would make for a much nicer and compact device. Although I am not fond of any button style battery since they tend to be more expensive than your garden variety AAA. Good idea about reducing brightness on the HF light. The HF light is about .995" diameter which I assume is a bit less than the loupe. I'm not sure which light I will use. Also, ambient light, through an empty hole(s) may be enough. I would aim the hole(s) at the cross-hair area. Anyway, a nice project and your great idea I will get to eventually.
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