Originally Posted by LesterOfPuppets

I'm just guessing about your axles' diameters since you say front axle is thinner than rear (at least that's how I read what you said in first post). Some olde bikes have even smaller than 9mm axles.

I'd guess about 8 minutes filing per side on the Hi-Ten fork I worked on. Mangaloy fork might take a bit more, but not much.