I have been giving this a lot of thought. I understand Essentialaudio what you are saying, but, to me, it is absurd to say the only way to install an anolog cart is with a digital microscope. So I went on clearaudio's site. They have a simple set of instructions to install the cart. To set the vta you measure the distance between the lowest part of the cart body and the test record, .2mm to .5mm. Now if you think about it, as your 92 degree angle, which I have read about elsewhere, it is all MATH! The cantilever should be the same angle off the cart body, with in a reasonable(minute) limit of error, on all the ones of a particular model and brand. Once you know that angle, the rest is easy to figure out. Hence the goldfinger solution. A simple, cheap set of feeler gages, then adjust by ear.