freeing a stuck carb

Another method. Scribe lines on the t/blades each side of the shafts for final positioning; mark blade position.

Blade screws are staked. Grind off the staking so that screws can be removed [ failure to remove staking will likely result in broken screws....]

Heat up alum with heat gun & dribble ATF over shafts. With blades removed, shafts will have some endplay. Tap end of shaft gently until you get movement. Repeat above until shafts are looose.

You can re-use the screws, use Loctite to secure.