I'm ordering a replacement battery latch for my laptop and I want to reinforce a place on it so it doesn't break like the original one. That place is too thin to support the battery weight. I need to fill the inside a '7' shape that's molded in the plastic so that the top of the 7 doesn't break off. JB Weld might do the trick if it sticks to plastic. Not sure what kind of plastic I have.