I am adding a photo of a genital preparation, which is very poor quality, but this preparation is already damaged and cannot be photographed again, so at least such a small help for determination. The photo of the butterfly is already on the page.
Monochroa inflexella : Slowakei, Štiavnické vrchy, Rybník, 180 m, 20. Juni 2008 (leg., coll. & fot.: František Kosorín), det. Zdenko Tokár, GP-1645