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.
fozgometer v2
I would love to use this but seems so wasteful to use it once. anyone wish to share or sell one?