Hey guys, Sorry if this has been posted before, but I thought I was making good headway taking the knob off and expecting to see a shaft that I could simply unscrew with a phillips and take the stopper completely off. Instead I found what looks like a "D" Cut/Half moon key hole. Images attached. My question is how do I get this damn thing off? Looking down that keyhole, I don't see any spot where I can grab onto with a screwdriver or a needle nose (if I even get can one down there). Any help you guys can send my way is appreciated, thanks in advance.