the Lazy Jacks.
The Defender Catalog or web will show the diagram.
You could "build" your own or have built -- but it woudn't save you any money.
(P.S. -- I have had and love our Dutchman system -- but we have an approximately 900 SF Main with a stick that is 73' off the water. I think you could go there, but a lazy jack system is less expensive and worked fine on our previous boat, a Sabre 42. By the way, you can still go with a loosefooted sail with a Dutchman -- ask me if that's applicable, or North doesn't explain it to you.)