Object A is pinned to Object B -- Object C is pinned to Object D -- Object E is pinned to Object F -- Object G is pinned to Object H
Object A is pinned to Object B and does not move at all separate of B, it moves hand-in-glove with B in its SINE motion
Object C is pinned to Object D and moves slightly in a rope-like fashion, it moves with D but offsets slightly in (D) its SINE motion
Make sense? I will review your link.