Laurie's idea will work mate! But if you have it variable brightness it will work heaps better. You've seen my idea...yes? A polar alignment scope illuminator out of my EQ5 mount screwed into a plastic dew shroud on my finder. (which IS variable brightness) runs off a few watch batteries. Seeing its variable brightness, I can use it on faint fuzzies as well as planets.
I would imagine they would be pretty cheap if you could get one.
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