To make that a little clearer, the smaller of the two pieces that make the X (the one that is held under the metal bar) has 2 little bars on each side, these 2 bars click into the bigger piece,
So if they the X isnĺt laying flat then just carefully push down on these 2 bars and it will lay flat. Then it will click into place.
the damn cat thought it funny to pull up my numpad 5 on my Acer Aspire 6530g and this left me with these 2 bars raised (so I didnĺt think they should be any different).
If none of this make sense, feel free to e-mail me or add me on windows live msn ľ firstname.lastname@example.org
In short - make sure the fixtures are Flat before trying to place the key, if they are not, flatten them?