By jingo i think your right barry,i've just checked my arm and if i understand correctly what you said above then a line drawn from the centre point...
i disagree,that might be fine with a conical stylus but with modern microline,shibata and Fritz Geiger profiles to get the best from them you do have...
it changes because your headshell and cartridge are offset to the pivot point,because they are they are moving in an arc when the tonearm goes up and...
i mean if you set azimuth correctly and then raise or lower the tonearm at the back to adjust sra/vta you are also changing azimuth and will have to...
hold out your right arm with your hand flat and pointing to the right,bending at the elbow drop your arm down and you will see your hand tilting,its...