How to fix Stiff water tap?


My water tap is getting stiff and hard to use. I saw https://kundforum.fmmattsson.se/org/fmmattsson/d/instruktion-fm-mattsson-9000-serie/ and it seems possible to fix by replacing some parts. However, the model is different, and I’m not sure how to pick it up.

Two questions.
1. Could you tell me the model number?
2. Which part should I order to replace? I'm not sure the part that the video shows is used for all models.
3. How to replace it?

Sangsoo Nam

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