you apply light to moderate pressure to the bar and kind of move your hand across the little bendy part and just let your hand slide off the end quickly to allow the bar to move. Hope that was understandable.
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yeah basically that, just kinda give it a little flick of pressure with your hand, just basically hit it and slide off
It's also easier to do with a more responsive tremolo like a Kahler or Ibanez Edge. Alternatively, you could go with a two spring setup to lighten up the feel of it.