whenever i try to put my whammy bar the scratch plate starts to lift off of my guitar and im afraid im gonna break it, if i put it less tight the bar doesnt really work very well. is this common or do i just have a crap guitar?
It's supposed to lift off.

Well i have a cheapo vintage trem, after some modding, when I go to a full divebomb (which is pretty decent for a trem like that) the bridge literally falls out, like half of the brdige pops up, :P