More that probably, or the cup it sits in. Just replacing the rod arm and ball will probably go the same way, if you can actually get that screw cap off, if it isn't rusted on solid and then hope it doesn't leak badly once it's back together.
Thanks fore the advice, i will get a new waste this morning.
Now, I am unsure how to remove the existing waste? There is no nut between the waste and basin. That off white ring in the photo is brittle material that can be broken away with my fingers but underneath there is no nut?
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