but the "fork" side is too narrow.
It looks like the brass part is slotted for a flathead screwdriver, but it didn't turn easily, and I didn't want to try to crank on it (which is hard with a screwdriver...) until someone tells me that is indeed the way to remove this :). Any suggestions?
------- Edit (update) ----- I got the brass nut off, and the chrome part simply lifted out:
It seems like exactly the same thing, just plastic this time! The wrenches still do not fit. I can't tell exactly what's happening past the 'X', but it doesn't look like it goes straight down into a pipe - it seems to start curving almost immediately and has something odd (to an untrained eye) right below the 'X' (see the red circle below):
There also seems to be some kind of an O-ring between the tub and the plastic "drain" piece below the tub:
I am starting to think this isn't supposed to be removed... can anyone confirm/deny?