UPDATE
Info & Video supplied by Gavin Colbourne
I found something out with the switch as you know there is a delrin insulator holding the switch in place then the top ring goes on to top of that, well I found that if that delrin is screwed down first before the top screw then the switch could be held in the ON position (positive top battery) BUT if you place the delrin inside the top screw then screw it down it will prevent the switch from staying on with positive top battery placement and it will also allow both nipple and nippleless batteries to be in that position.