I have a Kohler k-72760-4, and I can't figure out how to remove the aerator. It looks like an inside male threaded aerator and I tried buying a key to unscrew but it looks like I bought one that was too big, and even still I don't see the slots where a smaller key would fit.
What key do I need to remove, and can I remove without a key using a screwdriver or some other tool?