Second to that, probably what horizontal hinge motion really is (that it is the left wrist relative to the left shoulder hinge pin). Easy to show on a horizontal plane, confusing to many on the angled plane.
Third, loading as it relates to the flying wedges.
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"Support the On Plane Swinging Force in Balance"
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Simplicity buffs, see 5-0, 1-L, 2-0 A and B 10-2-B, 4-D, 6B-1D, 6-B-3-0-1, 6-C-1, 6-E-2
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