okay, not quite a typical hardware question. but it's terribly unnerving.

my keyboard's spacebar has ceased to operate in the manner it used to. it still seems to function perfectly well, but it has lost the .. i dunno. the keypressiness. somewhat as if it isn't returning to it's fully upright position, but i'm not certain that's actually the issue. i popped it off, with some difficulty, and there doesn't really seem to be anything springy involved. any tips?