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a good way to remove a metal bolt is to get a screw extractor. You drill a small pilot hole down the middle of the bolt, and lightly tap the extractor into the hole. The bolt will then twist out. You may need to add lube to the bolt if its rusted (WD-40 etc.)

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Q: How to drill out a metal bolt?
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The best way is to use a drill bit for metal and drill a small hole in the bolt. then use an extractor to back the broken bolt out.


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