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I succeeded in removing the screw using a small drill bit on a Dremel tool. With the drill and by hand (risky) I drilled a small hole in the center of the small screw, bottom end. After doing that I hogged it out to the side by simply applying lateral pressure to the bit. I stopped when I got to the edge of the threads. It took a while but by doing that in various directions pretty soon there was not enough thread left to prevent me from turning the screw.
Now, I found that the problem had been that the screw was bent. Wood in the stock was bearing on the screw not giving a straight shot between top and bottom tangs. A small rat tail file fixed that and now I have a period Marbles tang sight that actually allows me to see the front sight and target. I am a happy shooter.
Thank you for all the ideas and wisdom.
Mike
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