Many years ago, I did this on a pair of bath taps (not quarter
turn type ceramic valves). I think I found the kits in B&Q.
If the problem is that the thread has worn at the shut-off point,
you might get some restbite by fitting replacement plastic valve
seats, which will change the position of the shut-off point on
the thread. I did this a couple of years before replacing the
whole valve head.
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