May I recommend, instead of a file, a toothpick or other small, rounded object wrapped in 600 grit sandpaper?
Actually, you don't even need the object...just tear off a 3-4 inch by 1-2 inch piece(depending on which saddle you're working on) and roll it into a tube that fits your slot. Then rub it back and forth in a shoe-shine motion over the corner only. It'll knock the sharpness right off for you.
(Message edited by crgaston on October 15, 2006)
(Message edited by crgaston on October 15, 2006)