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I have a great 1939 10M that Id like to modify the position of the strap ring and rt thumb hook. Ive done the strap ring mod with a different 10M, but for the life of me cant remember the exact measurement. These seem to be fairly common mods, I know the strap ring needs to be moved down and the right thumb hook needs to come up and more rightward, but does anyone have some specific measurements or suggestions?