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you almost certainly have one of these, almost but not 100%
They are pretty standard
https://www.screwfix.com/p/flomasta-ceramic-tap-glands-24mm-x-2-pack/1908f
what are you tightening up??
Time to get a new cartridge
something like this, only an illustration. check your actual tap
https://www.screwfix.com/c/bathrooms-kitchens/reviver-kits-tap-spares/cat820108