Jig the nut, using only a GOOD drill bit (after all, you're drilling a grade
5 nut!), start drilling just enough to mark the side of the nut. Remove the
nut, and in a straight down fashion that prevents walking the bit, make a
nice little starter pit in the nut (1mm). Re-jig it and away you go. Once
you have the hole started, things go much better.
Glen
>I have had a tool like this for drilling safety wire holes in nuts and
> the heads of bolts. I have never been able to use it successfully,
> always breaking the drill or dulling it to uselessness as it abrades
> against the angled flat.
>
> http://tinyurl.com/3y83tx
>
> Have any of you used such a fixture successfully and can you tell me how
> it's done?*
> *
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