How to remove clutch pedal pin??

Remove the clutch master push rod like Zed Head said - then you can wiggle the fork a little. I've never had to remove the spring and we've pulled (and re-installed) a BUNCH of master cylinders (every single one a PITA)... We've pulled out pins that were worn nearly in half! That's an item that doesn't usually get much preventative maintenance.

However - I DON'T BLAME THEM...