The AA Rubber (the blue one in the picture to the left) is aligned with the spindle axis.
The Rubber (the red one in the picture to the left) is moved up or down to adjust the amplitude.
The amount that this rubber is set below the spindle axis is the measurement used above in the field, Rubber Distance Down.
The measurement for Headstock Lever Arm Length and Amplitude Adjuster Lever Arm Length remains fixed for the machine you are using.
The measurement for Amplitude Adjuster Lever Arm Length remains fixed for the amplitude adjuster you are using. (If you have multiple AAs, use the measurements for the one you are using.)
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