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An adjustable wheel moves a bump up or down that protrudes in to the top of the barrel.
As the BB passes by, that bump grips the top of the BB and causes it to spin backwards. The higher up the hop up, the more it pushes down on the BB. The more it pushes down, the greater the backspin. The greater the backspin, the greater the Magnus effect.
Also see, Bernoulli's principle.
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