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It's not easy! I used a 1/4" ratchet with extensions. A universal joint and 12mm deep socket on the end. There's a hole in the plastic trim roughly in line above the nut. Fiddly as anything but worked for me.

The squeak is gone and the pedal feels great after a fluid change.

Search for AUTOFREN SEINSA D1721

I ended up rebuilding instead. I managed to source the correct seal kit. Fitted my 2010 idtec. https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://m.autodoc.co.uk/autofren-seinsa/7875472&ved=2ahUKEwjH7p-5pq6AAxWdTEEAHZW6ArwQFnoECBUQAQ&usg=AOvVaw3YEuSL23LDK1-jATnFYDHu

Hi. Did you ever get an answer? I'm looking to buy a master cylinder and no-one appears to reference the correct part number.