Most machines made to date utilize twin in-feed scoops on the rotating casing. This is superficially attractive as a symmetrical feature to avoid out-of- balance forces on the casing. A single in-feed scoop version (with an opposite balance weight) is beneficial for delicate handling, sensitive feed control and to enlarge the swept pick-up area for difficult flow or larger particle size products. It is essential to ensure that the elevating capacity is not exceeded by the collecting mechanism otherwise some material in the flow path of the scoop will move around or over the scoop instead of into the casing. Optimization needs to be tempered with a margin of safety to deal with variable product conditions