Take the extractor out of the barrels, place it against the breech face, and see how much gap there is between the end of the extractor and the part of the roll that contacts it to lift the shells. This will tell you if there is anything to be gained by lengthening the end of the extractor, or even if you can do it. You may not be able to do it at all for I am holding a frame in my hand right now with the extractor against the breech face, and it is a perfectly flush fit on both ends. It is a hand fitted piece. Now when a Parker is open there appears to be play for one can move the extractor back and forth making one think he can make it longer, but not so if the barrels are closed based on how it fits apart.
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