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I've got a lower fender bolt that sheared off and it seems that the break point is deeper than the surface around it.

What sort of options or techniques do I have here? I've historically been unsuccessfully at drilling bolts out.

Top/front of bolt Bottom/rear of bolt

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Looking at that, I would suggest that you drill it out and then tap it to match a new bolt.

There are extractors but the most common are based on tapers and they will likely cause more issues.

The better type of extractor uses a hardened rod with flutes that is driven into a hole drilled to match the rod size. Then the rod is turned with special nuts to remove the remainder of the bolt.

Even with the application of duck oil, snake oil and other "magic" penetrants as well as heat I still think you are better drilling and tapping for a new bolt.

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  • Thanks, is the goal to tap is slightly larger than it already is? If so, how many sizes up should I aim for?
    – Joe
    Commented Nov 1, 2020 at 7:01
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    If you drill slightly off-centre then you "lock" the old bolt into position and can stay with the same size.
    – Solar Mike
    Commented Nov 1, 2020 at 7:02
  • Thanks for the tips. I was able to drill dead center and restore the existing threads
    – Joe
    Commented Nov 3, 2020 at 6:21
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Per SolarMikes suggestion, I drilled out the hole equivalent to M6 and retapped the threads.

pilot hole ready for tap tapped bolt threads in

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    Good job, have a nice day.
    – Solar Mike
    Commented Nov 3, 2020 at 6:40
  • 1
    Upvote for this update and self-answer. Good job
    – user60481
    Commented Nov 3, 2020 at 7:08

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