Whitmire notes that Sedna, thought by some to be an inner Oort Cloud object, may have also been perturbed by Tyche, since Sedna has an orbit well beyond that of Neptune.
When the rubber sack makes contact with an object, whether a glass, a pen, or other hard item, a narrow inner tube sucks a small percentage of air out of the sack, making it contract and conform to the shape of the object it touches.