fozgometer v2

@lewm Actually, the Foz works really pretty well, iff you make sure the test record sits perfectly flat. I had Acoustic Sounds send me a replacement of their test record – used for the Foz –  that was dish warped, but I also use both a 750 gr record weight and a 1500 gr outer limit ring to eliminate all possibility of dish warp. It's key to make sure the test record for the Foz is dead flat. I use them both for normal record playback too, to ensure records sit flat. Dish warps are inconsequential.

I have followed that up with a visual gauge and it seems spot on to me. I cannot use that for my 2nd tonearm though, which has a mono cartridge. The Foz is useless for that.

Please correct me if I’m wrong. I’m sure the foz works as advertised to equalize crosstalk. But what I and others have said is that in doing so, the stylus tip in many cases will end up slightly askew with respect to the groove, unless the coils and magnets inside were perfectly aligned at the factory. But if the cartridge is perfectly constructed, then you don’t need the foz. Just aligning the stylus with the groove walls will give you equalized crosstalk. 

I believe lewm makes a good point.  If there are small differences in the output of the cartridge, the Foz will compensate by skewing the cartridge, resulting in overall misalignment of the cartridge.  This effect is especially critical with line contact styli.  I have found that a simple mirrored alignment gauge and magnifying lens works well.