"Does the ASW19 have the ball on top of the rod like the 20?"

The 19's that I've looked at are like my 15 - two of each type of coupling inline and 90 degree. One of the 19's at my field uses captive pins (you'll see a picture of them in the original LBA AD about locking the L'Hotelliers along with the Ford type pins, "hairpins," sleeves etc.). I don't mind the plain pins on my 15 because all four connections are right up near the control access hatch and easy to see and reach. In a DG-400/202-17 or ASW-20 I would much rather have Wedekinds if possible. We still have one club glider with L'Hotelliers and it has Wedekinds. Definitely the easiest way of securing the couplings but a bit more involved to install compared to the manual safety pins.