The 2nd bit went crooked because it could not cut the material that the "backout bit" is made of.
As another poster mentioned, you are now in need of some _Carbide_ burrs. They like to turn fast and will work great in a die grinder. You just need two 1/4 shank bits: a ball end and a cylinder. Start with ball end shape to work on the broken bit pieces and to get you back on center. Then go back to drilling your pilot hole. Use a piece of stiff wire and your thumbnail to determine the depth of a hole you have already cleared. Use that number as your guide for how deep to drill.
With the pilot hole drilled you can open up the hole with a second bit. If you were perfectly on center then you could use a drill bit the same size as the root diameter of the bolt thread. If off a little then go a little smaller but you need enough to get the cylindrical burr in there.
Take the cylindrical burr and start removing the material from the side of the hole and stop once you begin to see a thread pattern. You can then take a sharp pick and start digging out the threads of the bolt from the threads in the hole. Sometimes you can take the thread end and twist it with needle nose pliers and the old thread will unwind.
Be aware that when the burr is cutting it will throw tiny shrarp slivers all over the place! A face shield makes great protection.
I used these techniques last week while salvaging a front bolster from a Farmall 350. Five of the Eight bolts for the frame rails were snapped off flush with the casting.
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