So, I am using @psychotiller’s 405 enclosure, but the concaveness of my deck is very deep, so when I place my battery on the deck and try to fit the enclosure on there is about a 3/8ths-inch gap between the enclosure and deck. Because of how big the battery is I can’t really flex the enclosure enough to seal it. I wanted to get some suggestions on how to fill this gap. Any input would be appreciated, thanks! I have attached photos.