Boring broken bolt

The threaded hole in which the bolt of the left, you can not hurt, if you do the following.

1. stake the exact center of a piece of the bolt. To facilitate the process the punching break a file, if possible.

2. Drill chip bolt. The diameter of the drill must be 0.8 thread diameter. For example, for a threaded connection M6 drill diameter should be 4.8 mm.

3. For larger drill bolts first use of small diameter drill.

4. Remove the bolt of the left after drilling, and "go" tapping.