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8.3-7 Tighten the lock nut and check once more in ac-
cordance with instruction 8.3-5.
8.3-5 Tighten the lock nut and check again to make sure
that the indicator moves slightly as soon as a very light
pressure is applied to the chest.
8.3-6 Loosen the lock nut on the inner tension rod (see
8.3-2). Adjust the thumb nut until 1½ red lines appear
on the hand-positioning indicator at 20 mm chest
depression and incorrect hand-positioning.
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