I have a shelf holder, with all but one of the shelves taken off, in my closet. They look like this:
I'd like to take the two uppermost things sticking out of it off - I have no idea what they're called. It looks like they are supposed to come off:
I've tried pushing up near the point where they connect to the rail, but they didn't show any signs of budging.
Should I just push harder, or is there a better way?