Just swapped generator heads last week. A neighbor's wife gave $400 at a pallet sale place for a 5500 watt generator. Engine runs great, but no AC. I took cover off to find wires removed, so it was a bring back. I was given a 5,000 watt generator with thrown rod years ago, so I told him if he paid labor I'd give him the generator head. So to remove the bad head I just loosened the retainer bolt, then through the cooling slots I pried on the armature and whacked the bolt and she popped right off. He now has something to show for his money but is only $100 from full retail, but at least he has a working generator.