Could someone help me understand? I don't understand what the benefit of this over just rotating the screw like a typical grain elevator? The idea is neat though! I wouldn't have thought it would act that way!,(reply>), Also fewer moving parts, and easier to maintain.,(reply>), Main difference is that you aren't having to carefully balance the weight of the screw so the rotational torque doesn't make it wobble - keeping a straight cylinder balanced is much simpler, lets you spin it a lot faster.