Ben, is that the spindle you got from me, I never thought of checking the Dia as I didn't know there would be a difference, here is what I have on them. I have a few used and NOS cottered cranks laying around if you want to use that spindle, let me know.

ISO= 16mm Nominal or 15.9 Actual
English= 5/8" (15.88mm) Nominal or 15.75-15.80mm Actual
French= 16mm Nominal or 15.9 Actual
Italian= 16mm Nominal or 15.9mm Actual

Glenn