My first injection mold and the Rabit HY-4 injection molder

[mekanik]

If you can get an engraving bit with the 60 deg angle you should be able to do it.
If you go over to http://www.model-engineer.co.uk/ and look up "D" bits this will show you how to make one from silver steel, drill your hole go in with the "D" bit to the required depth then tickle the hole with the engraving bit.
Good Luck
Mike