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| + | [* black] Turning the zeroing crank counterclockwise sets the counter digits to zero, while turning it clockwise sets the accumulator digits to zero. Amazing! |
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| + | [* black] Nelson White's 1920 patent [http://www.google.com/patents?id=lARhAAAAEBAJ|Zero-setting mechanism] describes how this amazing thing works. |
| + | [* black] This amazing thing practically never works properly on calculators after half a century of neglect. |
| + | [* black] On the right side of the carriage, unscrew and remove the zeroing crank. |
| + | [* red] 4-48 machine screw, 1/4" |
| + | [* red] Zeroing crank |
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