turning down the motor shaft?

[tashpop]

i have the kb xl brushless motor with the 6mm shaft. i have decided to just have it turned down instead of battling and searching for pinions. does anyone see a problem with getting it done to 3.2mm's so i can get all my gearing locally anytime? stock emaxx gearing is 3.2mm right? i could go with 5mm, but then i'm still ordering on line and i hate waiting, especially on such a small and simple part.