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rethreading a hole on a bicycle
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<blockquote data-quote="PeterT" data-source="post: 10135" data-attributes="member: 22"><p>I find half the battle of screw extractors is getting a proper hole & bite to begin with. Center popping & drilling the end of a broken fastener is a bit more challenging if it sheared at an angle or rough finish. The Dremel grinding burr might hopefully allow a new center. Try to peck drill with the burr vs. holding constant pressure like drilling, they typically don't like that much & can zing off. You might be able to then advance the new conical center with a good drill. Fasteners aren't typically fully hardened by they can be tough.</p><p></p><p>A lot of lugs like that are braze-ons (or I guess weld-ons if the frame is lighter alloy). So once you get stud out you don't have much choice but to properly drill & tap to larger size if threads are too far gone. Helicoil involves yet another tap.</p></blockquote><p></p>
[QUOTE="PeterT, post: 10135, member: 22"] I find half the battle of screw extractors is getting a proper hole & bite to begin with. Center popping & drilling the end of a broken fastener is a bit more challenging if it sheared at an angle or rough finish. The Dremel grinding burr might hopefully allow a new center. Try to peck drill with the burr vs. holding constant pressure like drilling, they typically don't like that much & can zing off. You might be able to then advance the new conical center with a good drill. Fasteners aren't typically fully hardened by they can be tough. A lot of lugs like that are braze-ons (or I guess weld-ons if the frame is lighter alloy). So once you get stud out you don't have much choice but to properly drill & tap to larger size if threads are too far gone. Helicoil involves yet another tap. [/QUOTE]
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rethreading a hole on a bicycle
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