"Straight" talk

The Foz is not self calibrating...there is a simple procedure. Mine always registers  0 to begin.  If you can set azimuth by ear...have at it. I know mine is correct.  The arm does have an offset, however, the arm moves up and down on the same plane as the pivot so that azimuth remains fixed.  That is certainly one of the benefits of a 2nd pivot on a unipivot arm.

@harold-not-the-barrel 

I think you're right, this is what Van Den Hul said in the interview:

 "In play position, your tone arm should not be parallel to your record but at a small angle: around 3 - 5 degrees. This can be achieved by lifting the tone arm at the rear (i.e. the bearing part and not the cartridge mounting part) by 4 - 8 mm. The sonic result is a better spatial reproduction and cleaner high frequencies."  

chakster.... who told you that?  ..just saw VandenHul...... this is not a hard and fast rule.  Maybe for VdH, but not as a universal rule.  Also, in regard to the arm used....   If the bearing is at a different angle than is the headshell/cartridge, the azimuth is constantly in flux ...changing with the rise and fall of the warp...not good

Chakster, I know I´m right and I completely agree with A. J. Van Del Hul.
Well, he is a specialist isn´t he. And he´s not the only expert with that opinion/experience in this complicated business.
Most of my carts perform best with flat or/and a bit high position but never in low position (then highs become worse both quantity and quality). Many things in analog /physics are simple atfer all.
But I must admit the Foz gadget is quite tempting...