Thank you for all your messages and sorry for my late reply. By core module, I meant the rear module, of course.
@AnotherElk, @lordreesmogg: Thanks for your tip, unfortunately I had bought the protective cover afterwards. As the screen had obviously failed due to moisture anyway, I would like to close the spot as best I can
@anon9989719: Thanks for the tip! I remodelled the missing part with a two-component methacrylate-based adhesive (Pattex 2K Stabilit Express, but any other or an epoxy-based adhesive will probably work just as well). Here is a short tutorial for anyone who has the same problem:
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separate the display from the case and stick a strip of adhesive tape around the curve of the display and around the bottom of the case.
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insert the display into the case and apply a thick layer of the mixed glue to the tape strip on the display.
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after the glue has cured (about one hour), carefully remove the display.
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sand the glue to the round shape with a file, also sand the underside so that the back cover fits on it, if necessary sand off excess material on the inside with a drill.
For me, it fit like a glove. There is only a minimal, almost invisible gap left, which is sealed by the protective cover.
