I got my Rubik's cube a week ago. I have lubricated it twice with no problems. I'm new to the cube, but I learned quickly so now I can do algorithms fast. However, after trying to lubricate it again, when I took off a corner piece, a thin cap-like object (not a center cap) came out of the cube. I didn't know what it was, and wasn't able to put it back in as I didn't know where it came from, but my cube still works fine.
Does anyone know what the piece is? (Note: It has a small '9' on it.)