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owl
If you can measure it, you can replace it
https://www.plumbers-mate-sales.co.uk/replacement-brass-valve-ceramic-disc-cartridges-130-c.asp
Soaking in citric acid / some other acid will remove the limescale, and you can replace the o-ring easily enough too. If there's crap on the ceramic discs, 1000 grit wet & dry can clean it up.