A while back I bought a '51 model A with a stuck motor. I got the engine to free up but for the life of me I can't get the pulley to move. I got all of the rusted clutch parts out, removed the drive disk, pulled the clutch fork and I can't get anything to free up. I've tried rocking the tractor with it in gear, tried beating on the pulley with a dead blow hammer. Any other suggestions?