Tom, what you have to do is grind a small tool that looks like a horizonal backwards capitol "L", no wider than the space between the extractor and the bolt face. You start at the firing pin hole and gentally let it feed out. I have done quite a few like this without removing the extractor.
When I do something like this, including chasing threads in actions, I turn the chuck by hand. That way you do not risk any thing happenning before you can shut things down.......jackie