I make my own harness 2 hook about 4 inches apart one hook through the nose (WHOLE CRAWLER)and other through down about 3/4 in the body let the crawler relax a sec. so you keep it pretty straight. My harness length was about 40" I used 2 oz. bottom bouncers 38 feet of line out then clipped on my smalll churchs tx12 boards then let them out to the side another 66 feet. The size of blades are #8 great big thumpers. trolled them at .9-1.2 mph