A paddle for playing with a hand sack includes a generally flat body sized and shaped to fit on a hand and one or more straps for securing the body to a person’s hand with a flat surface of the body being oriented upward to allow a person to manipulate a hand sack without touching it with the palm. Such a method permits very reliable and accurate monitoring of the load state of the grinding system. The external anode is a substantially membrane-free metal pipe configured to provide an electric charge to a fluid for electrocoating a part. The present invention further includes methods of making and using the solid dose delivery systems.