I have the Dennesen, the Clearaudio, the Pluto and the Project of this family of protractors. Even if the Dennesen was still available, (discontinued) I would buy the Clearaudio instead. Ιt gives the better sound (especially the r min=75mm) it has 4 options, it is fairly accurate and is a joy to use. But although I'm allways starting from here, it seems impossible to resist in making my own customised paper.
I'm starting from the furthest permittable Pivot to Spindle distance (on each particular armboard) and then I'm checking if I can reach the Effective Length which corresponds to this according the protractor. From this place, the VE comparator takes order to modify the curve of the plot to my own priorities. Usually I don't change the Pivot, but experimenting with the Offset Angle instead, watching the tracking distortion, and the innermost & outermost grooves in the plot of the VE comparator.
BUT ... even if you don't bother to make your own changes, (especially if you don't care to change the null points and stuck with the Baerwald alignment) it is worth to find a 2 point protractor, in order to adjust precisely the zenith! because this kind of protractors, they strictly offer only the inner null point and THIS IS NOT ENOUGH by all means!
In every other case you have to design your own paper with outmost care. It's fun and it helps to understand the whole situation that is taking place there and most importantly it gives you the essential self-assurance that nothing left to chance.