cool! thanks for that info! I think I copy/pasted this from a site the other day but now I don't remember where, it was the sewing needles conversion:
4, .90mm
5, .80mm
6, .73mm
7, .66mm
8, .58mm
9, .51mm
10, .46mm
11, .40mm
12, .35mm
13, .33mm
14, .30mm
16, .25mm
does it seem right?