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Slider of added rollers

Yellow conrod is connected to green slider via a second conrod (in violet). The latter has revolute joint with the green slider.

Orange rollers are pivoted on axis of the revolute joint between yellow and violet conrods.

Roller diameter is slightly smaller than the runway height to ensure that the contact between roller and the runway are only on one side of the rollers (upper or lower). Thus mainly rolling friction is applied to the runway.

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