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Well, I don't work with Nematocera, but personally I prefer to avoid making traditional slide preparetes. Most fly genitalia are well sclerotised and can be tried & glued on cardboard with little loss of detail. I keep very soft or very small genitalia in microvials filled with glycerol. If a high-magnification is needed I make a temporary mount using glycerol + microscope slides.

I find this to be sufficient, but I guess midge taxonomists will disagree ;)