Ehhh… I want to say the needle bearing either seized or came apart on you. The only way the flywheel should move with the axle is if the engine is running and the clutch is engaged. The drum should spin freely with with the axle. Have you ever replaced the clutch drum needle bearing or even greased it? Try taking a set of flat heads behind the drum and carefully wiggle it off (careful of clutch right behind the drum). If not, wait to see of Tony responds since he seems to have the most experience and knowledge with the Leopard. Keep us posted, I would like to know what happened.