Once the top is off you should be able to see the cartridge inside, this will be secured by a brass nut probably.
Remove the nut and pull out the cartridge. The outer body of the tap should then be able to be removed from the base.
On mine, the rubber seals were visible and able to be removed.
It should go without saying, don't use force and don't twist too much. Slowly and gently should get it done
As in my thread, I had O rings which were the right size and saved having to track down the OEM seals.
On reassembly silicone grease helps getting over the seals.
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