philthymike wrote on 06/24/19 at 05:06:26:So there's an alternate universe where the darn things work?
Sure there is. And Courageous Cat and Minute Mouse are real in another universe too.
If the seat bolt had been broken off because somebody tried to tighten it excessively.....the extractors work just fine (as the bolt is not locked into the threads by rust, galling or cross threading).
When the bolt head breaks off because you tried to remove it and the threads are locked into the frame - the extractor has very little chance of getting the bolt out as it likely cannot provide more torque than the original bolt head did.
In order to get it out (before you broke off the extractor)....you needed to use penetrating oil and/or heat to get the threads to release - then you may have some luck with the extractor.
Since this bike is horribly corroded - it is advisable that you use penetrating oil before you try to remove the bolts......and this should be days or weeks before you try to remove the bolts.
Once an extractor is broken off inside, it becomes much harder. I have used chain saw sharpening stones in a Dremel to slowly grind the bit out. Then I continue to use the stone to grind enough of the bolt away on one side so I can see the tops of the threads....then use a punch to loosen the remaining piece of bolt. It could take an hour or two to get this done on your seat bolt.
If you are very, very careful to get a hole in the center of the stuck bolt and try the extractor....if it doesn't come out stop before you break off the extractor - then use progressively larger drills and you hopefully can get the shell of the bolt out once it is paper thin.
Remember when we all told you what a project this bike was going to be? A lot of us have been down this road before and know what a challenge it is.