I just got Anatomy of the Ship: The Type VII U-Boat last week and they have a pretty good detail of the torpedo tubes. It looks like there is a way that it could be done manually as well at the tube in the event the automatic means failed through mechanical linkage.
I've always thought that some of the holes you see in the side of the torpedoes are where the mechanisms for making settings are inserted and then withdrawn at the time of firing.
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