OK, here's the nuclear option. You already have this first part done, but I'll describe it anyway. Get a dremel grinder and a couple diamond tips (carbide won't last). Very carefully grind off the cone down to the flange where it seats against the barrel (this part is already gone on yours). With the flange gone, sometimes an easy-out will get out what's left. 50-50 it won't work. Here's the hard part. Very carefully start grinding out the cone working from the flash channel out in spiral passes so that the flash channel gets gradually larger. The cone will turn into gray dust, which you need to clean out often. You want to grind to the point where you just cut into the base of the threads. You can see a darker spiral appear in the metal as you hit the threads. Once you see that spiral, stop grinding. Using a dental pick, or very dull Exacto #11 blade, peel the nipple threads out of the bolster. They should come out pretty easily once you get the first little bit lifted. If you go too far you will have to install a helicoil in the bolster. When all else fails I have had very good luck doing this. However, you have to have the nerves of a surgeon (or a dentist) to pull it off.
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