By eHow Hobbies, Games & Toys Editor
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The UFO yo-yo trick is typically used to adjust the tension of the yo-yo string so that it isn't too tight or too loose. If you throw the UFO to the right, it tightens the string. If you throw it to the left it loosens your string. Throwing a UFO to the right and a UFO to the left before beginning your tricks helps the string reach the perfect tension.
eHow Hobbies, Games & Toys Editor