Clutch Slave Cylinder replacement on 2010 Mazda 6 GH

Trying to find the problem of my clutch feeling, sticky and not smooth, only 2 culprits, clutch slave or throwout bearing. Let's start with the easiest. ( it turned into a HUGE mess)

Clutch Slave Cylinder link: https://www.autodoc.co.uk/ashika/8363062

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