Like Sid says.
I have fitted my Scotty to supply the oil through the small black capillary pipe to the side of the front (g/box) sprocket through a steel guide tube, but the principle is the same for the rear.
This arrangement holds the delivery pipe in a very precise place relative to the sprocket, which I reckon is the secret to getting the best from them.
I set it so that as a drop forms on the end of the black pipe, it reaches the surface of the sprocket and gets "picked off". You can watch this in "prime" setting. That way it always stays clear and ensures the oil goes onto the sprocket and doesn't get blown around (wasted and messy).
