[Flat6pac]

Did you remove the circlip off the clutch levers then remove the short lever as the spring lever is an idle arm, and possibly pinned in place. If you have a pin in the spring arm, once you’re separated, remove the pin and don’t replace. Reinstalling, the spring arm need to be cleaned and lubed to idle on the vertical.
Now, it is possible that the large arm is frozen on the vertical and not free to spin.
If all else fails, pull the 9 8mm Allen bolts off the pressure plate through the starter hole
Bruce