A6: Length = 148mm, required paper stop: 74mm, deviation: 0mm
A5: Length = 210mm, required paper stop: 105mm, deviation: 1mm
A4: Length = 297mm, required paper stop: 148,5mm, deviation: 0.5 mm
A3: Length = 420mm, required paper stop: 210mm, deviation: 0mm
A2: length = 594mm, required paper stop: 297mm, deviation: 1mm
This means if you want to create from DIN A5 sheets DIN A6 booklet, (that's probably the classic format for manuals of cameras or the same ones that you want to take) then you are not able to clinch this exactly in the middle !! !
Otherwise, the stapler is very massive, and the brackets of 40Blatt 80g paper is not a problem if you have the correct brackets. But what does it help if you precisely the bracket next to a millimeter sets?
Since the paper stop is an absolute bad design, there is only one star !! One could stop indeed make for Infinitely adjustable with a set screw and an accurate scale, but that Währe in production probably 1Euro expensive. It Währe even better to have a stroke as with any punch which engages only in the desired formats. However, a fixed pitch between the grid levels are in vain.