it's cool, and probably practical to rotate the shaft from the outsite rather than the screw.<br><br>Not sure what the inventor mean about it creating less dust tho, since it's the same mechanism, and only different rotating parts.,(reply>), @Average Picker Oooooh ok, that makes sense. thanks,(reply>), The rate is more constant and the cylinder screw gap larger. It creates less “leakage” of particles dropping so less dust build up.