Thank you Professor Brent. I will have to search for a photo and see if I can duplicate it.
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I looked in Campbell's, but found only the verbal description of it. Campbell had a lot of drawings and photos of most parts and variations, so the lack of rimless extractor drawings or photos is surprising. However, my search was quick and I should look again.
Modern highwalls by Winchester and Browning B78 are completely different under the hood, of course, but I wonder if you could get an idea from those and adapt it somehow.