How do you secure your ZR whammy bar?

I can't seem to get the arm to be tight; it keeps on popping out. Just pulling up lightly makes it come out.

Can you guys help me?

I'm pretty sure the bar is right though.

i know about the screw-in thing, but it doesn't get it tight enough.
just make sure you are screwing it in right and tight, then screw the little metal circle piece to hold it there
Open up the back of the guitar and look at where the tremolo arm screws into the block, there should be a black plastic thing there which is what the bar screws into.
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