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Mike,
most have answered the questions you pose.
Astromart is the best source, as with used you are less likely to lose.
I have a pair of them, so if you want to "borrow" one sing out. (I don't want to sell it).
I built one from an old binocular eyepiece ages ago, Robby has (or had) it. I may still have an etched reticle that you could use if you DIY.
Seekers idea has more merit.
Gary
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