QUOTE(autophile @ Jan 7 2007, 06:19 PM)
I may be stopping by on Sunday to brandish my new 0.4 mm cursive italic to see if I can get it adjusted for slower flow

Rob,
"What we have here is a failure to communicate." (With apologies to Strother Martin)
There can be profound differences in stroke width under different conditions:
- You might apply heavier writing pressure than I do; I use very, very light pressure. Heavier pressure forces the nib tines apart a little more, and you get a wetter flow and a broader stroke.
- You might be using paper that feathers more than my paper; your image shows a significant amount of feathering.
- You might be using an ink that is more prone to bleed or feather than my ink; Noodler's inks, especially the Polar and bulletproof varieties, are much "wetter" than ordinary inks, and they do in fact do this. Feathering produces a broader stroke.
How does this relate to your situation? Here's how:
I test every nib I sell, whether it's a specialty nib or simply a standard round nib. I use Waterman Blue-Black in a filled pen, on the same fountain pen friendly paper we sell on our site.
Note that the size I specify is the size of the ink line on the paper, not the size of the nib itself. This is not the same as most commercial nibs. Standard nibs always come up to their standard sizes; when I make a stub from a medium VP nib, I get 0.6 mm without having to measure the stroke.
Because your nib was not one of my standard sizes, I also measured its stroke under 25X magnification, with a reticle that allows me to tune a nib to within 0.02 mm of its specified size. Your nib produced a stroke exactly 0.40 mm wide.
As a related point, a fine nib should not produce a stroke 0.6 mm wide. Modern fine nibs should be, and I calibrate them to be, 0.5 mm. Vintage fine nibs produced 0.4 to 0.45 mm.
I'll be happy to see you in Philly, but I'm expecting to find that your nib still meets my specs.