this is how i run light stock. if the sheet size is 8.5x11, there should be 6 suction tubes in the width of the sheet. i run all 6 suction tubes open but put sucker feet on the 2 most out side tubes and the two most inside tubes. bring pile up to just over the first line on the sheet seperator brackets. start to add air till it puffs up the sheet nicely, then start to add suction till it picks up the sheet then go about 1/2 turn more.