It's tempting to prowl Surplus Shed to try to find a 50mm glass doublet, and get two of those to replace the plastic lenses.
Well, I'll be damned (no need, really, happened some time ago...) https://www.surplusshed.com/pages/item/L3955.html - 49mm fl, 13mm dia, coated, $7.50 and they say they have lots. Almost makes me want to get a "Krappy Kam" and put them in it.
The proper mounting is with the concave side to the subject and the f-stop in front of the lens. For some reason the center of curvature of the front element comes to mind as the stop position. Probably f/11 would be the stop to aim for - 5mm hole. The viewing lens can be 'wide open' at f/4.
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