I have to drill safety wire holes in a dozen bolts every month or so. I have
a jig to line it up and use an air drill.
http://www.aircraftspruce.com/catalo...rillingjig.php I bust an
HSS bit nearly every time, not bad for 36 holes. Since it always breaks
finishing the hole I can usually drive it back out with an automatic
centerpunch followed by a pin punch.
--
Stupendous Man,
Defender of Freedom, Advocate of Liberty