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In and extreme case you can try using the heat extremes, being careful how you do it. I can be enough to break the corrosion or whatever is holding the threads. Heat it first to expand the metal, then cool it trying to isolate the cold to the striker, using either a chunk of ice carved out to fit over the striker, or dry ice is even better and works in about 60 seconds. Then grab it with those vice grips or plumming wrench suggested and break it loose.
In and extreme case you can try using the heat extremes, being careful how you do it. I can be enough to break the corrosion or whatever is holding the threads. Heat it first to expand the metal, then cool it trying to isolate the cold to the striker, using either a chunk of ice carved out to fit over the striker, or dry ice is even better and works in about 60 seconds. Then grab it with those vice grips or plumming wrench suggested and break it loose.
I am sure everyone knows this but NEVER hold/carve dry ice with your bare hands!