so, when we installed my MM CC plates we did the passenger side wrong and now i have an ob-long hole. I wanted to weld it but everyone was like "oh! the heat! and the! and dont forget! and If you do that! and dont do that!"
you'll be best off sanding it down, looking at what you have to work with. if it *is* a crack, drill both ends of the crack with a drill, weld it, grind it, seal it, prime it, paint it.