Hello. I have a way pitted bathtub drain cover plate that I want to replace. Of course, what should be simple ain't. The drain control lever is installed on a rod with a Phillips head screw. Of course, it will absolutely not come off. I tried some penetrating spray. Any ideas? I guess I could replace the whole assembly but I just want to do a cosmetic job if possible and I just know since its plumbing it will be a PITA getting out of my tub. My plan was to just reinstall the lever on a new base plate. Ha.