Wenching

Has anyone got good gains from the Captain’s Wench? It allows me to stretch without my hand getting tired. However, I feel that the Wench stretches the base and internal part of my penis the most, and stretches the mid section of my penis second most, but the area that the Wench is covering (the upper portion of my penis) I feel that it does not stretch it at all. Could someone give me some pointers or alternative methods to stretching, because I lose my grip so easily when I use my hand.