You should always fold the wire over through the eye in the terminal so it cant come off and flop around inside the equipment if the terminal is overheated to the melting point of solder by a C13 cord with poor contacts. Yes its a PITA if you need to rewire it, and its generally nessercery to cut away as much wire and solder from the terminal as possible with sharp side cutters, before desoldering and sucking the hole clear.