Duncan Skyhawk Bearing.

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and having less spin time with 4a yoyos is normal if you are a beginner in 4a. The trick to get stronger throw is to throw it hard upward as if you are tossing it up high, but there is a tricky part, as the yoyo starts unrolling suddenly pull down to further increase spin, just enough so that the yoyo don’t go up too high, but pull down too much and the yoyo will just dive to the ground.
In short, throw upward hard, then suddenly pull it down to translate the upward momentum into spin.

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