Tapping the hole again go slow and easy with a lot of oil to lube and keep the tap from binding. If it breaks here time to start over. All of this can be skipped by silver soldering the little booger on a cable.
Now is the time to cut off the excess bolt. man I love my dremel tool. I'm really liking the cordless part of this tool I was afraid it would not have the torque of a cord powered but it works great.( dremel should be sending me a check for the advertisement for them)
Chasing the threads just to make sure