How do I safety wire the bolts too hard to drill through? I've gone through 3 bits, 2 drill batteries and 1.5 hours of solid drill spinning time to get 1/3 through the bolts holding the front brake lines. I got the hardest bit available for hardened steel and the bits just wear out.

These bolts have a groove cut on each side so I just ran safety wire around it, flattened the wire on each side of the bolt and it's tight. But I doubt it will pass tech.

What did you guys use? Any pics?

Thanks!