Well, it's behaving well enough for now that I'm hesitating to pull it. And Rich, I do think it's an obstruction more than anything else. Since we may be blowing up that bathroom, I may wait it out.
I think I may have found something like those squares, but am not sure. Not the same ones, but I'll check 'em and get back to you Rich.
Jim, you crack me up! And come to think of it, I know this toilet has swallowed its share of dental floss over the decades. Hmmmmm. . .