I just received my superplug and took a look at the included washer. It looks and feels like thick cardboard. I know there are a few members here who use this plug. I was wondering if any of you have had problems with the washer? I emailed superplug about this but haven't received a response yet. I'm a little wary of using this thing if the washer is going to disintegrate over time. Has anyone had any problems with it? I've had magnetic plugs on previous vehicles but not one that is touted to perform as well as this one, so I really want to use it.