I heard of some people out there able to spin the shuttle on a low serve by slicing across the base making it a legal serve. But I am not sure about the technique of spinning the shuttle while making it clear the service line. When I do it, it just pops up into the air going too high and short of the service line. If there's anyone out there who knows how to make the shuttle spin, tumble and a good low serve without illegally striking the feathers first? please message me the technique or post a video. Thanks