If you`ve got the Ibanez Edge pro trem then you may need to replace the two white plastic/nylon bushes that are on the whammy bar itself (the bit that goes into the bridge), to be honest, I had the same problem with mine, I replaced the bushes but it didnt make a huge or significant amount of difference.
I`ve kind of lived with it since and it doesnt really bother me having it swinging around.
I think some of the Edge trem systems (poss the Edge pro II?) has a small hex bolt in the bridge that you can tighten slightly to grip onto the whammy bar once inserted into the bridge.
there is some older posts on this and I think the general solution was to find something thin enough that you can push in with the whammy bar to help prevent it from swinging around.
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