Will, use some sort of epoxy and a piece of thin aluminum, the strongest shit you can get is called panel bonding adheasive, places like carquest and autobody paint supply places should sell it.. it takes about 8 - 12 hours to dry, I'd put it on the inside, IIRC its flatter than the outside and easier to get to...Make sure and use sheetmetal screws to hold it as tight as possible while its drying, and probly have some small stiff brushes near by to smooth it all out.