Drill press,emory cloth,lotsa beer for patience,Repeated oil dips.
Shouldn't take to long for a 1 mm ?
Drill press might be a bit difficult, I was thinking of rigging up something to get the motor spinning at partial throttle and then using either some really good sand paper or maybe carefully use my Dremel to take off little bits at a time.
All I ever wanted was an honest weeks pay for an honest days work.