Who often punches single sheets or little leaves, has a Probelm. Because the paper stop is adjustable, it happens that a piece of paper at the stop slips over and the sheet is skewed in the binding machine and the holes do not run parallel to the paper edge. But for multiple sheets work fine. Spiral about 25 mm must be pressed forcibly down in the comb, otherwise the opening hooks can not slide laterally along the ridge and block.