Dave, not trying to be a smart ass here, but I think (though admittedly not exactly sure where you're coming from on the 60 degree thing) you're fixated on a static perspective. As a matter of math, take 60 from 90 (which would be the two shafts, one absolute vertical the other absolute horizontal) and you're left with 30. Said another way, that picture is deceptive. The card probably is accurate at having a 30 degree edge, but imagine the lower shaft as a continued straight line, then flip that card to where the edge under the guys thumb is on that imaginary extended line and visualize how that 30 degree angle lines up against that upper, angled shaft. Or said another way he's measuring on the wrong side of the angled shaft. Eyeballing it I'd say he's slightly under 30 degrees, so is within spec for the deflection of the joint. Said yet another way, if the joint is laid flat, you should stay within the 30 degrees (in this example) at lifting of one end.