"Straight" talk

@clearthink wrote.

" Example: when we change VTA/SRA the AZ changes too "

It is obviously apparent from this claim that Raul is not well informed about the intricacies and standards involved with properly installing and aligning a phono cartridge/tonearm assembly as part of a Music Reproduction System or there would be no way Raul would make this claim.

You observation is ONLY correct if you are talking about linear tonearms or tonearm without an offset.  Basic geometry tells you that cartridge azimuth will change with a change in pivot height due to the fact the cartridge stylus is not in a direct line with the pivot i.e. offset tonearm/headshell. 

If you need to visualize the effect, assume that the headshell offset is 90 degrees.

@don_c55, you are assuming that the stylus is perfectly aligned and affixed to the cantilever with absolute accuracy, which rarely happens with a hand made component.