How do I get the allen bolt out of my bike when the head broke clean off?

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AntonG

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While adjusting my disk brake, I broke the head of an allen bolt right off, and now the rest of the bolt is stuck inside the hole with nothing to twist it out with. I don't know where to start. Can a bike shop deal with this or will I have to take it to some sort of machinist? Thanks for any help.
 
You can get a back out drill bit tool from Home Depot or Lowes that fits in a drill and remove it yourself. It is a reverse headed tool that will or should back out the shaft of the bolt just be carefull and if you do not want to try then let your LBS do it for you...also might want to apply a few drops of penetrating oil and let it work in before you do!
 
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