I always thought you had to try and get the panel off from inside somehow, this is a lot easierI almost wanna drill mine and plug it at home so if I'm out somewhere and it fails, I won't need to worry with a drill or anything. I found some plugs with an embossed texture on Amazon: https://www.amazon.com/Plastic-Snap...SWZ6Y6YMZDR&psc=1&refRID=58E6TKBGJSWZ6Y6YMZDR
Although I'd be one to get a metal electrical knockout plug and spray paint it or polish it for dat billet look, yo :