.... by wrapping a bungee with a ball head on it around the sail...or you could take the sail off and lash it to the AKA.\
I use a ball bungee but took off the ball after the second time with the sail reefed some I was "slapped silly"
by the ball.
I've also towed a bit with the AI. Mostly, you don't even feel something back there, but have had problems with the line hitting, snagging the rudder or rudder assembly. I've been trying to come up with something simple to keep the "tow" line above the rudder assembly without causing the AI too much loss of control by too much pull to the far rear (trouble turning). Any ideas?
P.S. If you have too much "sailing withdrawl" during the winter, come on over and play! Friends and I have 4 AI's between us so there's always room.