Not really, in a king if it gets between the drive rings it will seriously impair the engagement, because the teeth on the driverings are so shallow, but in a ratcher n pawl mechanism is will at most interfere with one pawl and then most likely not to a great extent. Imagine a 1mm diameter piece of grit between ringdrive plates, go to bromleybikes for a picture of plates, it will cause serious bother, the same piece of grit in a ratchet and pawl system will cause very little bother.