So i've had my olympus pen eed for a while now and i noticed some battery corrosion forming on the battery contact inside the battery compartment. I unscrewed the metal contact bit and cleaned it up but when i went to screw it back on the nut on the otherside has fallen away so there is nothing to screw it to. You can hear the nut moving around inside the body. Does anyone know how i could reconnect the metal contact so it will connect the electrical system back up? I've attached some photos to show the problem.