i have a caple filter tap and the tap has started dripping i have looked for a replacement cartridge with no luck they all seem to have splines at the end which mine don't have also mine has a spacer half way along.
you are correct there are inner splines but these arnt used the tap handle attaches to a screw which is screwed through the tap cap into the cartridge as you can see in the photo the dimple which the screw locates
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