LOL! safety wiring is a #####. I have no real advice. Drilling through the corner is okay. Also some times instead of trying to go through at an angle, you can come from the top and side and make like a 90 in there, the wire will still go through. You will clean out all of the local stores of small drill bits, and even though its probably too late you will want to spend 100 on some good pliers. Ones that wont mark up the wire or break in your hand making you need stiches.