I was wondering the reassembly diagram for a Tunze 6100... I broke it down but cant figure out which goes where... the propeller and the white thing and the magnet are together, but I have the red o-ring and then the black plastic piece that goes in the very back. I can't figure what the order is and which way the black thing faces. is the smaller circle end towards the pump and then the o-ring? Any links to diagrams would be appreciated.