I took off one keycap (left arrow key) to clean the surrounding metal better, and I've got the assembly in and what not, but the top half of the key refuses to snap into place leaving an angled key with the bottom half snapped into place but the top you can still pull up with ease. I have no idea what I'm doing wrong. I tried to replicate the problem on the key next to it, and sure enough. That one won't go back in place, either. What do I do? I've been fiddling with it for almost an hour now.