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I've seen lots of reports of quality issues with the threaded nuts failing on dhb shoes letting down otherwise good vfm products.
It's not clear if they are bonded in from the outside or the more standard design inserted from the inside (with tabs stopping them falling out).
If its the latter, a replacement might be found somewhere easily and cheaply, assuming the carbon sole around the holes is is sound.
£30 carbon soled lace up DHB shoes:
https://www.wiggle.com/p/dhb-dorica-carbon-road-shoe