That suggests the interaction between the disc and the shepherd body is still going on.

ECONOMIST: Astronomers may have stumbled on the birth of a solar system

Every Aston-Martin body is sanded using hand-held orbital sanders with a 400-grade sanding disc, dampened with a fine mist of de-ionised water, and sanded again with 1000-grade discs.

FORBES: A Private Tour Of Aston-Martin's Factory