This is fascinating to me, as someone naive to the hobby. Can you describe what you're looking for and what adjustments you'd make? Are there two halves of the nib that need to be at the right spacing and alignment for proper ink-wicking or something like that? Does that affect the smoothness of the interaction with the paper too?

I routinely work under a high-magnification dissecting scope to build experimental equipment for neuroscience, but I never considered that people would be doing this to optimized their writing instruments.