Locking Bolt issues

[DonVoigt]

STOP, take a rest.

One can't drill it out, you will ruin the frame, the spring is harder than the surrounding metal and the drill will dive off center.

Take a picture of what you have and post it.

I would use a punch from the bottom to the inside of the retaining hole, you will likely have to make one, the driving diameter should be just a little longer than the thickness of the frame where the hole is, other wise it will bend; of course it must be smaller than the hole.

Sometimes you can improvise using a paper clip, sounds nuts, but they are pretty strong.
Find one that will enter the hole, cut it off just a bit longer and tap. Soaking should allow it to move.

If you can get to the part sticking out with stout needle nose pliers or needle nose vise grips,
grab it and twist and pull at the same time.

if you can't get it out, bite the bullet and send it to lugerdoc.