My "small" easel is an Ahel 3 (with three adjustable blades, instead of four as in the Ahel 4). The paper on that one is aligned to pop-up stops -- the larger the paper, the further away from the centre are the stops, so as to keep the paper in the middle of the base. The Ahel 3 then has printed scales on the easel-arms to allow each border to be set precisely. It looks as though the photo of the Ahel 4 shows graduated knobs on the end of the arms to carry out an equivalent function. The version of the Ahel board which I have is accurate and robust so you wouldn't regret using one, assuming the price is acceptable and you can't find a Beard or upper-range Kienzle.