the screw is not rusted. I have tried wd40 to loosen it, but nothing has happened. it is completely stuck. I want to try other ways before using a drill. it has been screwed into a window pane. if untried heating the screw to expand it, everything around it would get hot as well. space is extremely limited, so a hacksaw would not work because of its size. I can't make a new ridge or groove to help loosen it either...