Hello @123_
Welcome to the Bunnings Workshop community. It's sensational to have you join us, and thanks for sharing your question about your tapware.
I suggest having a look at this guide - How to replace a tap washer. It will give you a general idea of how to repair your leaking tap. Once you've gone through the guide and it appears that your tapware does not use jumper/tap washer valves, odds are it uses a ceramic spindle assembly. A ceramic spindle assembly is basically an all-in-one spindle that has the on/off function integrated into it. Its ceramic parts can't be removed or replaced. Just to be on the safe side, if you do happen to have such a spindle, I suggest bringing your old spindle to the store to make sure the model you are buying is at the same height.
If you have any other questions we can help with, please let us know.
Eric
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