As others have mentioned, with a buntline hitch tie the downhaul line to the second hank from the top, to keep from folding the top corner over and causing the hank to bind on the forestay. In my case, I found it unnecessary to thread the downhaul line into any of the hanks. Simply not needed, plus it's faster and easier to hook up. I use 1/8" braided dacron line through a small block clipped to the stem, then back through a couple of stanchion mounted fairleads.... which can be used as guides for a roller furling line if that upgrade is ever made, to a small, simple, inexpensive vee cleat.
The beauty of this system is that you can literally drop the sail under control at any time. Up wind, I can stand in the cockpit, straddling the tiller steering with my knees, and drop the sail neatly on the fore deck with the halyard in one hand and the down haul in the other. Downwind, I can steer the boat so the jib is in the shadow of the mainsail and control the drop so that I can steer the boat directly under the sail at the appropriate time. Cleating the down haul line will also insure that the sail stays securely on the foredeck, until it is needed again.
If you single hand alot, the jib downhaul, along with a reliable tiller pilot is one of your most useful sailing tools. Have fun.