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If one thumb is enough for a well made mechanism (worked beautifully on my Bauhaus this afternoon), you can rest that little finger and reserve it for some other activityJust about every low A horn will close all the bell keys with the low A key. The question is how well do they seal. I still argue that the laws of physics keep the force of one thumb from working as well as one thumb plus one pinky, now matter how well the mechanism is designed