I've went to ace and checked online for help with this aerator/ nozzle key/tool. It's a 8mm/5-16 Allen hex with 2 slots and it seems to be threadlocked in there. No one I've talked to has ever scene anything like it. All I want.to do is replace whatever it is with a decent aerator. Any ideas? I suppose I could make a tool... but that lock tight is hard as crap. Use a torch? I am a auto mechanic... not a plumber. Thanks.