Use some penetrating oil on the threads (PB Blaster, etc.). Get some left handed drill bits and drill larger holes, preferably in the center of the sheared off bolt. It may be that the left handed drill bit will grab and extract the sheared off bolt all by itself. If not, the more of the sheared off bolt that you can remove with the drill, the better (the more centered you are, the more of the sheared off bolt you can remove) as it weakens the bolt. You may be able to use Dremel tool and to created a more centered starter hole before you start drilling. Stop short of removing any of the threads in the boss itself. Last resort is to use an EZ-out that is basically a left hand threaded hardened tapered tap that is designed to grab the sheared off bolt. The bigger the hole, the bigger of an EZ-out that you can use (bigger = stronger). DO NOT snap the EZ-out off in the sheared off bolt - err on the side of caution here, the EZ-out is very tough steel and hard to drill through. Not for the faint-of-heart, but you can also cut a slot through the threads of the boss and bolt on one of the flats of the boss. This will weaken the boss's grip on the bolt. if this works, you can repair with JB Weld, a tap, and a file. Heat is another option, but I assume you like your paint.
If all else fails - -> Single Speed! Laing On Friday, March 10, 2023 at 2:43:21 PM UTC-5 [email protected] wrote: > Hello everyone, I've gotten myself into a bit of a predicament with one of > my downtube bosses; I've sheared off the bolt flush with the brazed on boss > (see pic below). Any ideas on how to extract it? I've tried using a drill > extractor bit with my drill, but didn't work. > > Thanks! > > Ryan > > [image: 3DE5D487-0675-43CD-85A8-74193FE2964C.jpg] > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/49871c62-c459-4b55-83d8-3e1d0ced96f9n%40googlegroups.com.
