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The simplest way of telling you how to do it is look to the end if the rail and when you get there just turn your shoulders. You dont need to jump. Just turn your shoulders in the direction you want to spin and your body will follow.
the way i do ti is just pop a little bit and try to think about it like just doing a normal spin and not to think that you are on a rail that was my biggest mental block...soon you'll get one down and then it will be really easy for you