Hi all, just picked up my model 3. I don't have a charging point at home so I have run a cable out of my letter box to charge it for the mo. Anyway, using the mains cable, you cannot open the charging point from the button on the cable head- it that supposed to work? - in fact I'm not even sure if it is a button or just a round dot. Or is it just the type 2 or super charger cables where you can open the port from the cable head?