Not a dry dropper wrench but a drop shot . I tie an double over hand knot where the point fly would go or I use a heavy bead head fly . Then about 12 inches above I tie a blood knot and attach a dropper loop with a perfection loop and put an unweighted fly or lightly weighted dependent on current flows. Crane I use two flies bigger water I use two flies and a split shot dropped off the eye of my point fly. Very effective for short line work. Dry dropper is rare but I will use it occasionally on crane .