Upon closer examination, it appears that the flapper is getting hung on the edge of the drain. There's a hollowed out cone on the bottom of it -- it's purpose appears to be to create an air bubble, which pushes the flapper up when the lever is pressed. I'm assuming this is a common feature, but that's the sticking point. Adding weight might work, since a mere touch is sufficient to cause it to fall into place -- perhaps it simply needs to wear sufficiently to clear the drain and that's what the super meant about it breaking in.
I'll try adding a paperclip tomorrow. If that doesn't work then I guess we'll call the superintendent and have him deal with it.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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