How do I remove the entire clutch assembly from the transmission housing on an IMT 407 walk-behind mower?

[Mower2025]

Hey folks,

Got an old IMT 407 that's got a seized clutch. Need to pull the whole assembly out of the casing to replace it. I've drained the oil and taken off the guards, but the center bolt just spins the pulley. No puller on hand.
Any simple steps or tricks to get it off the crankshaft? Tools: sockets, breaker bar, hammer.

Thanks!