I did the flight single handed last time. At lock 3 I called CaRT out to assist in opening the gates, with two of the top gate paddles open, plus one ground paddle ( the second ground paddle was inoperative ) The leak on the bottom gate was such that it was impossible to open a gate..
By the time CaRT's stalwarts arrived, I had enlisted the assistance of a team of Rugby players, and with four stout men on the beam, they just managed to open a gate.
Have fun.
P.s. Lock 3 is NOT the worse.!!!!