hillbilly74 wrote:

I have a very bad tendency to over-complicate things. If you have a friend with a drill press then you can skip the whole heat treatment. Just use plenty of oil so it doesn't get hot, and to help lubricate. Drill at a slow speed. Be sure to use a metal cutting drill bit and not a wood only one.

My experiences with a drill press is that when the drill gets almost to through the metal, it has a tendency to twist it, and, in the case of a very thin and narrow piece of hardened spring steel, it would shatter it just as the drill goes to the other side.  It may be user error on my part--but I know having tried to drill through thin and narrow hardened pieces of metal in various shops I've worked in.  Putting an "eye" through spring steel--especially that small and thin--is near almost impossible--as least for this cowpoke.