I seem to be munging up some of my saw nuts
using a conventional screwdriver.  The only
screwdrivers I have, which have a thin enough
blade to fit in the brass nuts, are only about
1/4" wide and don't nearly fill the entire
slot.  This results in dented areas in the
slot from the edges of the screwdriver blade.

These are NOT split nuts, but the newer style.
I find lots of information about split nuts
and filing a groove in a screwdriver to fit
them, but nothing about a screwdriver to 
properly fit these nuts.

I have looked in hardware stores and on the
web for a screwdriver with a blade wide and
thin enough to just fit these nuts, but they
don't seem to be out there.

To those of you who are able to loosen/tighten
these nuts without damage...
Do you just grind down a thicker screwdriver blade?
Do you make your own screwdrivers?
If so, what do you use for the steel blade?

Waiting for enlightenment,

Thanks,
Ted