But how does Ajmal get drift then? He scrambles the seam and drifts it more than most others nowadays.I think it is a combination all of the above.If you want to get the latest drift you should have the perfect seam position.If there is no enough revs on the ball the magnus effect wont come into play. As far as the speed Warne said "The pcae should be in which you get your maximum spin. So,it is a combination.If one of the element is lacking you might not get your late drift