ha! you ask the best questions

i drill the hole ever so slightly smaller than the screw im gonna use.. then when installing the screw i use a propane torch and heat the screw up so that it melts the hole a little, as i
thread it in. get it snug but do not tighten while the screw is warm. you should practice this a few times before you try it on the actual box u are gonna use. screw should be hot to touch but far from glowing hot.