Tool advice

[James F Juhas <james.f.juhas@snet.net>]

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?*
*